Copycat Costco Chocolate Muffins (Print Version)

Rich, jumbo chocolate muffins with melty chips just like the iconic Costco bakery classic.

# Ingredients:

→ Dry Ingredients

01 - 1 3/4 cups all-purpose flour, spooned and leveled
02 - 2/3 cup unsweetened cocoa powder, sifted if clumpy
03 - 1 tablespoon baking powder
04 - 1 teaspoon baking soda
05 - 1 teaspoon salt
06 - 1 teaspoon espresso powder (optional)

→ Wet Ingredients

07 - 1/2 cup unsalted butter, melted and slightly cooled
08 - 1 1/4 cups granulated sugar
09 - 2 large eggs, at room temperature
10 - 2 teaspoons vanilla extract
11 - 3/4 cup buttermilk, at room temperature
12 - 1/2 cup sour cream, at room temperature

→ Chocolate

13 - 2 cups semi-sweet chocolate chips, divided

# Steps:

01 - Preheat oven to 425°F and line a 6-count jumbo muffin pan with large muffin liners.
02 - In a medium mixing bowl, whisk together flour, cocoa powder, baking powder, baking soda, salt, and espresso powder until well mixed.
03 - In a large mixing bowl, whisk the melted, slightly cooled unsalted butter with granulated sugar until mixture is smooth.
04 - Add eggs one at a time, whisking well after each addition. Stir in vanilla extract, followed by sour cream and buttermilk. Whisk mixture until smooth and fully combined.
05 - Fold dry ingredients into wet mixture, then add 1 1/2 cups semi-sweet chocolate chips. Mix by hand just until incorporated; do not over mix. Batter will be thick. Allow to rest for 10-15 minutes at room temperature.
06 - Portion batter evenly among muffin liners, filling nearly to the top. Sprinkle remaining 1/2 cup chocolate chips over the tops.
07 - Bake in preheated oven at 425°F for 5 minutes. Without opening the door, reduce temperature to 350°F and continue baking for 19-25 minutes, until the tops are domed and a toothpick inserted comes out with a few moist crumbs.
08 - Allow muffins to cool in the pan for several minutes before transferring to a wire rack. Enjoy while warm or at room temperature.

# Notes:

01 - Resting the batter before baking promotes a tall, bakery-style dome.
02 - Reserve some chocolate chips for sprinkling on top for a professional presentation.

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