Costco Coffee Cake Muffin Recipe

This Costco Coffee Cake Muffin Recipe is a moist and buttery recipe, which is made with sour cream and a brown sugar swirl. It’s the perfect breakfast treat, ready in about 45 minutes.

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Costco Coffee Cake Muffin Recipe Ingredients

For the Muffins:

• 1/2 cup unsalted butter, melted
• 1 cup granulated sugar
• 2 eggs, room temperature
• 1/2 cup sour cream
• 1/4 cup buttermilk
• 2 teaspoons vanilla extract
• 2 cups all purpose flour
• 1 Tablespoon baking powder
• 1/2 teaspoon salt

For the Cinnamon Sugar Swirl:

• 1/2 cup brown sugar
• 2 teaspoons ground cinnamon
• pinch of salt

For the Buttery Crumb Topping:

• 1/3 cup brown sugar
• 3/4 cup all purpose flour
• 2 teaspoons ground cinnamon
• 6 Tablespoons butter, melted

For the Glaze:

• 1 1/2 cups powdered sugar
• 1 teaspoon vanilla extract
• pinch of salt
• 2-3 Tablespoons milk

How To Make Costco Coffee Cake Muffins

1. Prepare Oven and Pan: Preheat the oven to 425°F. Line 10 standard-size muffin cups with paper liners.
2. Mix the Muffin Batter: In a large bowl, beat the melted butter and granulated sugar together. Add the eggs one at a time, mixing well after each. Stir in the sour cream, buttermilk, and vanilla extract. In a separate bowl, whisk the flour, baking powder, and salt. Gently fold the dry ingredients into the wet ingredients until just combined.
3. Make the Cinnamon Fillings: In a small bowl, stir together the brown sugar, cinnamon, and salt for the swirl. In another small bowl, combine the brown sugar, flour, and cinnamon for the crumb topping. Pour in the melted butter and mix with a fork until coarse crumbs form.
4. Layer the Muffins: Spoon a layer of batter into the bottom of each muffin liner, filling them about halfway. Sprinkle a spoonful of the cinnamon-sugar swirl mixture over the batter. Top with another layer of batter, filling the liners about three-quarters full.
5. Add Topping and Bake: Sprinkle a generous amount of the crumb topping over each muffin, gently pressing it into the batter.
6. Bake the Muffins: Bake at 425°F for 5 minutes. Then, without opening the oven door, reduce the oven temperature to 375°F and bake for an additional 15 minutes, or until a toothpick inserted into the center comes out clean.
7. Cool and Glaze: Let the muffins cool in the pan for at least 15 minutes. While they cool, whisk together the powdered sugar, vanilla, salt, and 2 tablespoons of milk for the glaze. Add more milk if needed to reach a drizzling consistency. Drizzle the glaze over the warm muffins.

Recipe Tips

• How do I get a high, bakery-style dome? The two-temperature baking method is the secret. The initial high heat of 425°F causes the muffins to rise rapidly, creating a big, domed top. Reducing the heat then allows the inside to cook through without the outside burning.
• How do I get a distinct cinnamon swirl? When layering, be careful not to mix the cinnamon-sugar swirl into the batter. Just sprinkle it on top of the first layer of batter, and the second layer will cover it, creating a nice ribbon of cinnamon inside the muffin.
• How do I keep my muffins moist? The combination of sour cream and buttermilk is key to a moist, tender crumb. Also, be very careful not to overmix the batter once you combine the wet and dry ingredients. Mix only until you no longer see streaks of flour.
• Can I make the crumb topping ahead of time? Yes, you can prepare the crumb topping and store it in an airtight container in the refrigerator for up to 3 days. This can be a great time-saver.

What To Serve With Costco Coffee Cake Muffins

These muffins are a complete treat on their own, but they are especially delicious with:

• A hot cup of coffee or a latte.
• A tall glass of cold milk.
• A side of fresh fruit.

How To Store Costco Coffee Cake Muffins

Store: Place the completely cooled muffins in an airtight container. They will stay fresh at room temperature for up to 3 days. Placing a paper towel in the container can help absorb excess moisture and keep the topping from getting soggy.

Costco Coffee Cake Muffins Nutrition Facts

• Calories: ~450 kcal per muffin
• Protein: 5g
• Fat: 20g
• Carbohydrates: 65g
• Sugar: 40g

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

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