Step 1

Preheat the oven to 350 degrees. Place muffin liners in a 12 cup muffin tin.

Step 2

To make the oat flour, place 1 1/2 cups rolled oats in a food processor and process until it is very fine. (Note: Do NOT try this with steel cut oats, as they are a very different texture from rolled oats!)

Step 3

In a medium bowl, whisk together the oat flour, oats, nutmeg, cinnamon, allspice, baking powder, and kosher salt.

Step 4

In another bowl, mix together the milk, egg, maple syrup, and vanilla, then gradually whisk in the oil.

Step 5

Mix the wet ingredients into the dry ingredients until smooth. Allow to sit for 10 minutes while the oats re-hydrate.

Step 6

Meanwhile, dice the apple. After 10 minutes, gently fold in the apples to the batter. Then use a 1/4 cup measure to spoon the batter into the prepared muffin tin.

Step 7

Bake for 20 to 25 minutes until puffed and golden.