German Chocolate Cupcakes

Ingredients

• 12 tablespoons (1 � sticks) unsalted butter, at room temperature
• ⅔ cup granulated sugar
• ⅔ cup light brown sugar, lightly packed
• 2 extra-large eggs, at room temperature
• 2 teaspoons pure vanilla extract
• 1 cup buttermilk, shaken, at room temperature
• � cup sour cream, at room temperature
• 2 tablespoons freshly brewed coffee
• 1 � cups all-purpose flour
• 1 cup unsweetened cocoa powder, such as Pernigotti
• 1 � teaspoons baking soda
• � teaspoon kosher salt
• 12 tablespoons (1 � sticks) unsalted butter
• 1 (12-ounce) can evaporated milk
• 1 � cups light brown sugar, lightly packed
• 4 extra-large egg yolks
• 1 teaspoon pure vanilla extract
• � teaspoon pure almond extract
• 2 cups sweetened flaked coconut
• 1 cup blanched, sliced almonds, toasted (see Note)
• 1 cup chopped pecans