Jumbo Lemon Blueberry Costco Muffins Recipe

Giant muffins are moist and tender, loaded with beautiful floral flavor from vanilla and sweet blueberries, and elevated with refreshing lemon zest.

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Hello Daring Bakers!

WHY YOU’LL LOVE THIS RECIPE: This easy but Chef-Gemma-approved Jumbo Lemon Blueberry Costco Muffins recipe saves you a visit to a crowded Costco! These big muffins are moist and tender, loaded with stunning floral taste from vanilla and candy blueberries, and elevated with refreshing lemon zest. One chunk is sufficient to persuade you that home made Lemon Blueberry Costco Muffins might be even higher and may be your new favourite! 

In lower than an hour, you’ll have your kitchen smelling great with these irresistible home made Lemon Blueberry Muffins. Additionally don’t miss my Loopy Muffins recipe: A one-stop store for muffin fundamentals and infinite taste variations!

Desk Of Contents

What Are Jumbo Lemon Blueberry Costco Muffins?

Lemon Blueberry Muffins are a muffin variation consisting of recent lemon zest and blueberries. These muffins are attribute of their candy and tart taste mixture alongside their moist and fluffy texture. The largest distinction on this recipe is that, similar to Costco muffins, they’re jumbo – and who doesn’t love jumbo muffins?

Homemade giant Costco muffins on the cooling rack, with crispy golden brown crust and bursting with floral juicy blueberries.

These muffins are probably the most well-liked flavors and are nice to eat for brunch, dessert, or as a snack. As a result of they include tangy elements reminiscent of buttermilk and plain yogurt and so they’re jumbo-sized, it makes them additional moist and extra hearty than extraordinary muffins.

Love these Home made Lemon Blueberry Muffins? Then it’s best to attempt my different lemon blueberry desserts: Gluten-Free Pound Cake, Crepes, Popsicles, Cheesecake Bars, Eton Mess, and Curd Bread Pudding!

Substances You Want for Lemon Blueberry Costco Muffins and Why:

Dry Substances

  • All-purpose flour: All-purpose flour has 11th of September% protein content material which is able to assist bind your whole moist and dry elements collectively and create the bottom of your muffins.
  • Granulated sugar:
    • Granulated sugar is also referred to as white sugar.
    • Granulated sugar not solely completely sweetens your muffins, but additionally coats air bubbles within the batter to stabilize the aerated construction for a lightweight and fluffy end result.
  • Baking powder:
    • Most Baking powder available on the market is “double-acting”. Moreover activating via warmth throughout baking, baking powder will get ACTIVATED IMMEDIATELY combined with moist elements. DO NOT let the batter sit for too lengthy. Bake it off ASAP for the most effective rise with out dropping effectiveness.
    • Baking powder comprises dry acid “cream of tartar” so can get activated with any liquid that doesn’t need to be acidic to leaven baked items.
  • Salt: A pinch of salt will add depth and construction to your muffins whereas balancing the sweetness.
  • Baking soda:
    • Baking soda doesn’t include acid, so it prompts ONLY when combined with acidic elements like buttermilk and yogurt.
    • Baking soda reacts with acid from buttermilk and yogurt additionally eggs to launch gasoline, which creates air pockets to make muffins rise.
    • Baking soda additionally reacts with scorching sugar to present the muffins a crispy pores and skin.

Moist Substances

  • Eggs:
    • Eggs all the time have to be at room temperature in baking until specified in any other case.
    • Eggs enrich flavors, present emulsifier from yolks to bind all ingredient homogeneously, and incorporate and retain with egg whites to make muffins fluffy and mushy.
  • Buttermilk:
    • Buttermilk is a tangy, acidic dairy product made by including micro organism tradition to exploit.
    • Buttermilk provides a wonderfully tangy taste, implements tons of moisture and tenderizes muffins. 
  • Vegetable oil:
    • Oil is all fats with out water so it doesn’t contribute to gluten strands.
    • Oil offers fats to retain air which retains muffins additional moist and lightweight, and most significantly helps forestall your muffins from going stale.
  • Plain yogurt:
    • So as to not intervene with the lemon or blubbery taste, use plain yogurt.
    • You may make plain yogurt utilizing my Find out how to Make Yogurt recipe! 
    • Yogurt comprises acid to tenderize the gluten to make muffins extraordinarily mushy.
  • Butter:
    • Melted butter is essential for buttery, wealthy flavors and moist textures in muffins.
    • Butter additionally contribute to the good golden brown crust of your muffins.
    • To soften your butter, place items of it in a microwave-safe bowl and microwave for about 30 to 45 seconds. If there are any leftover items, stir them round and they need to soften away.


  • Lemon zest: You’ll be able to’t have Lemon Blueberry Muffins with out lemon zest! The lemon peel holds probably the most lemon taste and can add a recent citrusy taste.
  • Vanilla extract: Vanilla extract elevates taste and sweetness in muffins. Strive making Home made Vanilla Extract from scratch!
  • Blueberries:
    • Blueberries not solely pack nice candy and tart flavors, but additionally add an indigo pop of colour to your muffins.
    • Be at liberty to make use of recent or frozen blueberries. DO NOT thaw frozen blueberries. 

Homemade Lemon Blueberry Costco Muffins Recipe Ingredients

How To Make Lemon Blueberry Costco Muffins:

  • Earlier than baking:
    • Preheat the oven and generously butter a muffin tin. You may as well use a standard-sized cupcake pan and bake for a shorter time.
    • Making the batter:
      • DO NOT over combine. Put together dry and moist elements individually then mix them JUST till every thing comes collectively.
      • Gently fold in recent or FROZEN blueberries. DO NOT thaw frozen blueberries to keep away from wetting the batter.
    • Divide the batter evenly among the many muffin cups.

Step-by-step instructions on how to make Lemon Blueberry muffins. Mix dry and wet ingredients in two separate bowls then mix until JUST combined. Gently fold in blueberries.

  • Baking:
    • Bake on a center rack within the oven till golden on prime and a skewer inserted into the middle comes out clear.
  • After baking:
    • Let cool within the pan earlier than eradicating. Serve heat or at room temperature.

Scooping the batter into prepared greased muffin tin before baking. Cooling in the tin after baking.

Gluten-Free, Vegan Lemon Blueberry Costco Muffins

Notice: Making substitutions could change the feel and taste of your muffins. Use no matter you may have available or no matter works greatest for you. When doubtful, experiment!

Can I Make Lemon Blueberry Costco Muffins Forward Of Time?

  • You’ll be able to NOT make the muffins batter forward of time and let it sit with out affecting their oven spring. As a result of baking powder will get activated the second combined with any sort of moist elements. 
  • Nevertheless, you’ll be able to combine all elements BESIDE baking powder and baking soda forward of time.
    • Maintain the combination within the fridge for as much as 3 days.
    • When able to bake, sprinkle baking powder and baking soda over the batter then gently fold them in. On this case, take care to not over combine! Then proceed per this recipe.
    • The apparent profit of creating the muffin batter prematurely is to handle baking time with much less stress. The bonus is that muffins are typically slightly softer from additional time for dry ingredient to get hydrated to lock in moisture.

How To Retailer Lemon Blueberry Costco Muffins

  • Room temperature: One of the best ways to retailer leftover Lemon Blueberry Muffins is to maintain them in an hermetic container (after cooling fully) at room temperature for as much as 2 days. 
  • Fridge & Freezer: You may as well retailer muffins in an hermetic container within the fridge for as much as 5 days or within the freezer for as much as 3 months.
  • To reheat frozen muffins, allow them to thaw at room temperature then wrap them with aluminum foil and bake within the oven at 350°F/180°C for 10-25 minutes. Or pop them straight into the microwave for about 20 to 30 seconds.


Ought to I take advantage of frozen or recent blueberries for muffins?

  • Recent blueberries: It’s nearing blueberry season, so it’s the right time to get some follow in with some recent blueberries. Recent blueberries could also be on the tart facet, so if you wish to sweeten your muffins, I recommend including a bit extra sugar.
  • Frozen blueberries:
    • I like to recommend utilizing frozen blueberries as a result of they’re frozen throughout peak season, making them additional candy and ripe.
    • You’ll want to use them straight from frozen in order that it doesn’t add additional moisture to your muffin batter.

Can I substitute common milk for buttermilk on this recipe? What can be utilized rather than buttermilk?

  • No, don’t substitute a impartial liquid milk for an acidic buttermilk. Milk lacks sufficient acid to react with the elevating agent to make muffins rise properly.
  • The acid will react with a elevating agent to launch gasoline to yield a superb rise and  will break down protein in flour to make baked items softer. On this means, the protein gained’t have massive holes so moisture will probably be lockedd in. So you’ll get mushy and moist outcomes.
  • Buttermilk, plain yogurt, and bitter cream can substitute one for an additional and also you make them at house!
    • Buttermilk is thinner so that you wish to use as much as 3/4 in a single go and modify it to get the identical consistency because the recipe.
    • Strained or Greek yogurt works the most effective amongst yogurt.

Can I take advantage of lemon juice as a substitute of lemon zest?

Sure, you’ll be able to substitute them with lemon juice should you don’t have recent lemons for lemon zest. Nevertheless, the lemon taste will probably be much less current.

  • It is because the peel of lemons carries the robust lemon taste that everyone knows. Moreover, lemon juice tends to be extra acidic than lemon zest, so experiment with small quantities to steadiness the flavors.
  • To substitute, you’ll be able to incorporate about 6 tablespoons of lemon juice for each tablespoon of lemon zest. You’ll want to be aware that the extra liquid you add to your muffins, the much less fluffy your muffins could prove.

Can I take advantage of muffin liners?

  • Sure, you’ll be able to completely use muffin liners if you would like a better time taking out the muffins or make them simple to seize and go.
  • The primary distinction with utilizing liners as a substitute of greasing your muffin tin is that your muffins will not be as crispy on the skin and so they can get caught to your liners.

Why are my muffins soggy? How do I forestall soggy muffins?

Your muffins can prove soggy should you depart them to chill within the muffin pan for too lengthy or if there was an excessive amount of moisture on and in your elements. To forestall soggy muffins attempt the next suggestions:

  • Take away muffins from tin: Leaving your muffins to chill too lengthy within the muffin tin causes steam to lure between the muffin backside and the tin. Be certain to take your muffins out on the 15-minute mark to make sure your muffins gained’t be soggy.
  • Take away extra moisture: The first offender to an total soggy muffin is an excessive amount of moisture. You’ll want to pat your blueberries and lemon dry if recent from washing. If utilizing blueberries from frozen, don’t thaw them earlier than use. Condensation will develop on the skin of the blueberries and internally make them too juicy. 

How do I get my muffins out of the tin? Find out how to forestall muffins from breaking?

To get your muffins out of the tin with out breaking them, allow them to cool for quarter-hour. Gently run a butter knife alongside the perimeters of the tin to loosen your muffins. Ready to take away your muffins will enable your muffins to agency up and launch them from the perimeters of the tin.

Gemma’s Professional Chef Suggestions:

  • To make the Costco-size muffins, you want a Jumbo Muffin Tin. Nevertheless, you should use this batter to make 12 common muffins. Bake at 350°F (180°C) and for 15-20 minutes. 
  • You’ll want to use room-temperature elements for the most effective outcomes.
  • If utilizing frozen blueberries, don’t thaw them or they’ll launch an excessive amount of juice into the batter.
  • To evenly divide your batter, use an ice cream scoop!
  • For simple elimination, gently slide a butter knife across the edges of your muffin tin to loosen your muffins. They need to simply come out.
  • Be at liberty to switch the blueberries with blackberries or raspberries. I don’t suggest strawberries as they launch an excessive amount of water when baking and throw off the feel of the muffins.
  • Add some chocolate chips for added sweetness and chocolate taste!

Half of a muffin in front loaded with juicy blueberries, showing the soft and bubbly tender inside. Other muffins are in the back.

And don’t miss extra on a regular basis baking recipes in my NEW Greater Bolder Baking Each Day Cookbook!

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