Step 1

Preheat oven to 400°F. Lightly spray or grease a muffin tin with oil. Set aside.In a large bowl, combine oats and buttermilk. Let sit 15 minutes.

Step 2

In a second mixing bowl, whisk flour, baking soda, baking powder, salt and cinnamon.

Step 3

Stir the oil, egg, brown sugar and vanilla into the soaked oat mixture. Add dry ingredients. Stir just until combined. Do not overmix. Gently fold apples into the batter.

Step 4

Spoon the batter into the prepared muffin tin. Bake 12 minutes. Remove from the oven. Let the muffins cool in the pan 5 minutes. Transfer to a cooling rack.