Are you a fan of Costco's delicious blueberry muffins? If so, you're in luck! Get ready to get baking and enjoy the bakery-style taste of your favorite blueberry muffin from the comfort of your own kitchen.
In a large bowl, combine the milk, melted butter, eggs, cake mix, sour cream, and vanilla pudding mix until you achieve a smooth mixture. Gently fold in blueberries or chocolate chips if desired.
Combine the topping ingredients in a separate bowl and stir together until a crumb-like consistency is achieved.
Preheat the oven to 350 F (175 C) and grease a muffin tin with butter or non-stick spray. Fill each cup two-thirds of the way full with batter and sprinkle the topping over each muffin. Bake for 45 minutes, then allow to cool for 10 minutes before serving. Enjoy your homemade Costco Blueberry Muffins!
Notes
For an extra layer of sweetness, you can sprinkle a tablespoon of sugar over each muffin before baking.
If you don't have frozen wild blueberries on hand, you can use fresh or canned blueberries instead.
For the best flavor, be sure to use ripe berries that are sweet and juicy!
You can also substitute the vanilla pudding mix for a different flavor such as chocolate or strawberry.
If you want to make a larger batch of muffins, you can double this.
These homemade Costco blueberry muffins are best enjoyed fresh from the oven!