Red Velvet Cake - Alton Brown

Ingredients

• 1 cup all-purpose flour
• 1 cup cake flour
• 1/2 ounce natural cocoa powder
• 1 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 1 cup low-fat buttermilk, at room temperature
• 1 fluid ounce red liquid food coloring
• 1 tablespoon white vinegar
• 1 teaspoon vanilla extract
• 1.5 cups dark brown sugar
• 8 tablespoons (1 stick) unsalted butter, at room temperature
• 2 large eggs, at room temperature
• 12 ounces cream cheese, at room temperature
• 6 tablespoons unsalted butter, at room temperature
• 1 1/2 teaspoons vanilla extract
• Pinch kosher salt
• 13 1/2 ounces powdered sugar