Preheat oven to 450°.
Line a baking sheet with parchment paper or a silicone baking mat.
In a large bowl, combine flour, sugar, baking powder, salt and cayenne pepper.
In a large glass measuring cup or another bowl, whisk together buttermilk and butter.
Pour mixture over dry ingredients and stir using rubber spatula just until moist.
Gently fold in cheese.
Using a ¼ cup measuring cup, scoop the batter evenly onto the prepared baking sheet.
Bake in oven 10-12 minutes or until golden brown.
Brush the tops with topping.
Serve immediately.
Chef's notes: To Make Sour Milk: Measure 1 tbsp Lemon Juice in a 1 cup liquid measuring cup. Pour milk to the 1 cup line. Let set for about 5 minutes.