1. Step
Preheat oven to 350 degrees F. Line twelve 2 1/2-inch muffin cups with paper bake cups; coat inside of cups lightly with cooking spray. Set aside. Place the 2 cups oats in a food processor or blender; cover and process or blend until finely ground. Transfer ground oats to a large bowl. Stir in whole-wheat flour, sugar, baking powder, 3/4 teaspoon apple pie spice, baking soda and salt. Make a well in the center of the flour mixture; set aside.