Sugar-Free Costco Lemon Blueberry Muffins: A Healthier Twist on a Classic Favorite

Costco’s famous muffins are a hit in our family—big, fluffy, and packed with flavor—but the sugar content can be overwhelming, and let’s not even talk about the ingredients. Inspired by my brother and sister-in-law’s Costco trips, I set out to recreate their beloved lemon blueberry muffins without any added sugar. The result? A lighter, healthier muffin that tastes just as good (if not better) than the original, with a fresh, zesty lemon and blueberry flavor!

These sugar-free muffins use wholesome ingredients like kefir, yogurt, and coconut oil to ensure they stay moist and delicious, even without the sugar. The added lemon and vanilla extract boost the flavor profile, making sure you won’t miss the sweetness. And, of course, the giant size makes them even more fun for little ones to eat—these muffins are nearly as big as my toddler’s face!

Why You’ll Love Sugar-Free Costco Lemon Blueberry Muffins

• Sugar-Free: Made without refined sugar, these muffins are naturally sweetened with fresh fruit and yogurt.

• Moist & Fluffy: Thanks to kefir, yogurt, and coconut oil, these muffins stay moist and delicious, even without sugar.

• Big Flavor: A combination of lemon and blueberry makes these muffins a refreshing treat that everyone in the family will love.

• Great for Kids: The jumbo size and fresh fruit make them a fun and healthy snack for little ones.

Ingredients for Sugar-Free Costco Lemon Blueberry Muffins

• All-Purpose Flour

• Baking Powder

• Salt

• Baking Soda

• Eggs (room temperature)

• Kefir (can substitute buttermilk)

• Coconut Oil (melted)

• Plain Yogurt

• Butter (melted)

• Lemon Extract

• Pure Vanilla Extract

• Blueberries(fresh or frozen)

How to Make Sugar-Free Costco Lemon Blueberry Muffins

Step 1: Preheat & Prep

Preheat your oven to 375°F and grease a 6-cup muffin pan with butter.

Step 2: Mix Dry Ingredients

In one bowl, whisk together the flour, baking powder, salt, and baking soda.

Step 3: Mix Wet Ingredients

In a separate bowl, combine the eggs, kefir, coconut oil, yogurt, melted butter, lemon extract, and vanilla extract.

Step 4: Combine & Stir

Add the wet ingredients to the dry ingredients and stir until just combined. The batter will be thick and slightly chunky—don’t overmix!

Step 5: Add Blueberries

Gently fold in the blueberries until evenly distributed.

Step 6: Fill Muffin Cups & Bake

Fill the muffin cups all the way to the top, as the muffins will rise and spread. Bake for 35-40 minutes, or until the tops are golden brown.

Step 7: Let Cool & Enjoy

Allow the muffins to cool before enjoying.

Sugar-Free Costco Lemon Blueberry Muffins

These muffins offer the same great taste as Costco’s famous ones but without any added sugar.

Prep Time: 20 minutes
Cook Time: 40 minutes
Total Time: 1 hour
Servings: 6

Ingredients

• 2 ⅔ cups all-purpose flour

• 1 tablespoon baking powder

• ½ teaspoon salt

• ¼ teaspoon baking soda

• 2 large eggs (room temperature)

• 1 cup kefir (or buttermilk)

• ½ cup coconut oil (melted)

• ⅓ cup plain yogurt

• 5 tablespoons butter (melted)

• 2.5 teaspoons lemon extract

• 1 teaspoon pure vanilla extract

• 1 ½ cups blueberries (fresh or frozen)

Instructions

1. Preheat oven to 375°F and grease a 6-cup muffin pan with butter.

2. In a large bowl, mix flour, baking powder, salt, and baking soda.

3. In another bowl, combine eggs, kefir, coconut oil, yogurt, butter, lemon extract, and vanilla extract.

4. Stir the wet ingredients into the dry ingredients until just combined.

5. Gently fold in the blueberries.

6. Fill muffin cups to the top and bake for 35-40 minutes or until golden brown.

7. Cool and serve.

Variations & Customizations

• Make them Dairy-Free: Use dairy-free yogurt and coconut oil for a dairy-free version.

• Add a Crunch: Add chopped walnuts or almonds for a nutty crunch.

• Vary the Berries: Swap blueberries for raspberries or blackberries for a different flavor.

Frequently Asked Questions

Can I use frozen blueberries?
Yes! Just be sure to fold them in gently to prevent the batter from turning purple.

Can I substitute other flours?
While all-purpose flour works best for fluffiness, you can experiment with almond flour, though the texture may be denser.

Can I make mini muffins?
Absolutely! Reduce the baking time to about 15-20 minutes if using mini muffin pans.