Ingredients
Cookies:
1 1/2 cups all-purpose flour
1/3 cup dark or Dutch-processed cocoa powder
1/2 teaspoon instant espresso powder
1/2 teaspoon salt
1/2 teaspoon baking powder
1/4 teaspoon baking soda
1/2 cup (1 stick) unsalted butter, room temperature
1 1/4 cup granulated sugar
1 egg
1 teaspoon vanilla extract
Filling:
3 1/2 ounces (1 bar) milk chocolate, chopped
1/3 cup unsalted butter, room temperature
2 cups powdered sugar, sifted, plus more as needed
2 tablespoons heavy cream, plus more as needed
1 tablespoon malted milk powder
1/2 teaspoon vanilla extract
pinch salt
Preparation
