Costco Blueberry Muffin Recipe

This Costco Blueberry Muffin Recipe is a jumbo and soft recipe, which is made with fresh blueberries and buttermilk. It’s the perfect breakfast treat, ready in about 55 minutes.

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Costco Blueberry Muffin Recipe Ingredients

• 2 ⅔ cups (13 ⅓ oz/378 g) all-purpose flour
• 1 cup (8 oz/225 g) granulated sugar
• 1 tablespoon baking powder
• ½ teaspoon salt
• ¼ teaspoon baking soda
• 2 large eggs, at room temperature
• 1 cup (8 fl oz/240 ml) buttermilk
• ⅓ cup (2½ fl oz/71 ml) vegetable oil
• ⅓ cup (2 ½ oz/71 g) plain yogurt
• 5 tablespoons (2 ½ oz/71 g) butter, melted
• 1 tablespoon lemon zest
• 1 teaspoon pure vanilla extract
• 1 ½ cups (7 ½ oz/213 g) blueberries (fresh or frozen)

How To Make Costco Blueberry Muffins

1. Prep the Oven and Pan: Preheat the oven to 375°F (190°C). Generously butter a 6-cup jumbo muffin tin.
2. Combine Dry Ingredients: In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and baking soda.
3. Whisk Wet Ingredients: In a separate large bowl, whisk together the eggs, buttermilk, vegetable oil, plain yogurt, melted butter, lemon zest, and vanilla until the mixture is smooth.
4. Make the Batter: Pour the wet ingredients into the dry ingredients and gently fold them together with a spatula until just combined. Be careful not to overmix; a few lumps are okay. Gently fold in the blueberries.
5. Fill the Muffin Cups: Divide the batter evenly among the 6 jumbo muffin cups. The batter will fill the cups to the top, which is necessary to get that classic, big muffin dome.
6. Bake the Muffins: Place the muffin tin on a middle rack in the oven and bake for 35 to 40 minutes, until the tops are golden brown and a skewer inserted into the center of a muffin comes out clean.
7. Cool and Serve: Let the muffins cool in the pan for 15 minutes before carefully removing them. They can be served warm or at room temperature.

Recipe Tips

• How do I prevent the blueberries from sinking? Before folding the blueberries into the batter, toss them with a tablespoon of the dry flour mixture. This light coating helps suspend them in the thick batter, ensuring they are evenly distributed throughout the muffin.
• Can I use frozen blueberries? Yes, frozen blueberries work perfectly. Do not thaw them before adding them to the batter, as this can cause them to bleed and turn the batter purple.
• How do I get a moist, tender muffin? The key is not to overmix the batter. Once you combine the wet and dry ingredients, fold them together gently until you no longer see streaks of flour. Overmixing develops the gluten and can lead to tough, dense muffins.
• How do I get those big muffin tops? Filling the jumbo muffin cups all the way to the top is the secret. The thick batter and the leavening agents will cause the muffins to rise up and out, creating that signature crispy-edged, bakery-style dome.

What To Serve With Costco Blueberry Muffins

These jumbo muffins are a meal in themselves, but they are also delicious with:

• A generous pat of salted butter.
• A hot cup of coffee or tea.
• A tall glass of cold milk.

How To Store Costco Blueberry Muffins

Room Temperature: These muffins are best eaten the day they are made. Store completely cooled leftovers in an airtight container at room temperature for up to 2 days. Placing a paper towel in the container can help absorb excess moisture.

Costco Blueberry Muffins Nutrition Facts

• Calories: ~580 kcal per muffin
• Protein: 8g
• Fat: 28g
• Carbohydrates: 75g
• Sugar: 40g

Nutrition information is estimated and may vary based on ingredients and cooking methods used.

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