Preheat the oven to 450 degrees F. Spray a baking sheet with cooking spray and set aside.
Whisk together flour, baking powder, pepper, sugar, garlic powder, baking soda and cayenne pepper in a large mixing bowl. Add the cheese and toss to coat.
Whisk together the buttermilk and mayonnaise in a separate bowl. Make a well in the center of the dry ingredients and add the wet ingredients. Stir until the flour is moistened, then fold in the piquillo peppers. Drop heaping teaspoons onto the baking sheet, spacing them about 1 inch apart. Brush the tops with melted butter. Sprinkle with flaky salt and additional black pepper. Bake until the tops are golden brown, 9 to 11 minutes. Enjoy right away!
This recipe has been updated and may differ from what was originally published or broadcast.