Spray a muffin pan with cooking spray.Use a 2 ounce ice cream scoop to scoop the batter into each mold. Bake for 15 minutes.
If using a cast iron skillet:
Place a 10 inch skillet into the oven as it heats.Once the temperature reaches 400, remove the pan from the oven and add 2 tablespoons of butter. Swirl it to coat the entire bottom of the pan as well as the sides. Immediately pour in the batter and quickly spread it to the edges.Bake for 15 minutes.