Blackberry Farm Griddle Cakes

Name: Blackberry Farm Griddle Cakes
Ingredients: 1 large egg; 2 cups buttermilk; 1/4 cup pure maple syrup; 1 cup gluten-free oat flour; 2/3 cup yellow cornmeal; 1/3 cup brown rice flour; 1/4 cup buckwheat flour; 1 tablespoon baking powder; 1 teaspoon baking soda; 1 teaspoon kosher salt; 1/4 cup (1/2 stick) unsalted butter, melted; Vegetable oil (for skillet); Ingredient info: Gluten-free oat flour, buckwheat flour, and brown rice flour can be found at natural foods and specialty foods stores and some supermarkets.