Whole Wheat Pancakes

Name: Whole-Wheat Pancakes
Ingredients: 4 tablespoons (1/2 stick) unsalted butter; 1 1/4 cups whole-wheat flour; 2 tablespoons granulated sugar; 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 1/4 cups buttermilk or whole milk; 1 large egg; 1 teaspoon vanilla extract; Cooking spray; Butter and maple syrup, for serving