Red Velvet Waffles with Cream Cheese Glaze

Name: Red Velvet Waffles with Cream Cheese Glaze
Ingredients: 2 cups all-purpose flour; 1/4 cup cornstarch; 1/4 cup granulated sugar; 2 tablespoons unsweetened natural cocoa powder; 2 teaspoons baking powder; 1 teaspoon baking soda; 1/2 teaspoon kosher salt; 2 cups buttermilk; 1/2 cup vegetable oil, plus more for the waffle iron; 2 large eggs; 2 teaspoons liquid or 1 teaspoon gel red food coloring (optional); 1/2 teaspoon vanilla extract; 4 ounces cream cheese; 1/2 cup powdered sugar; 2 teaspoons milk