Preheat oven to 350º F. Spray a mini-muffin pan with nonstick baking spray or use muffin liners and set aside.
Whisk together the dry ingredients: flour, sugar, baking powder, baking soda and salt in a large bowl. Mix the wet ingredients: buttermilk, egg, and melted butter in a medium mixing bowl. Pour the buttermilk mixture slowly into the flour mixture, stirring to combine as you pour. Allow the batter to rest for about 3 minutes.
Scoop pancake batter and fill each indention of mini muffin pan about 1/2 full. Bake for 13-15 minutes, until a toothpick inserted in the center comes out clean.