High-Altitude Buttermilk Devil's Food Cake

Ingredients (16 items)

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• cooking spray
• 2 ¾ cups cake flour (such as Pillsbury® Softasilk®)
• 1 cup unsweetened cocoa powder
• 1 ½ teaspoons baking soda
• ½ teaspoon salt
• 1 ¾ cups white sugar
• 1 cup butter, softened to room temperature
• 2 teaspoons vanilla extract
• 1 teaspoon almond extract
• 2 ¼ cups buttermilk, divided
• 2 eggs
• 1 ¼ cups butter, softened to room temperature
• 2 teaspoons vanilla extract
• 1 teaspoon almond extract
• 6 tablespoons milk, or more as needed
• 2 (16 ounce) packages confectioners' sugar