SERVINGS: 11 gems or 12 standard muffins
Preheat the oven to 425 F and grease a gem or muffin pan with nonstick spray.
Whisk the cornmeal, flour, sugar, baking powder, and salt in a large bowl. Add the melted butter (no need to stir yet).
Whisk the milk, sour cream, and egg in a liquid measuring cup. Add to the bowl and mix well to combine.
Pour into the greased pan and bake 18 to 20 minutes until golden brown. Spread the tops with butter right out of the oven and serve with more on the side.