Preheat the oven to 350°F. Grease a non-stick muffin tray or use paper liners.
Mix the dry ingredients (oat flour, almond meal, almond flour, cinnamon, baking soda and salt) together in a large mixing bowl.
Mix together the wet ingredients (butter, apple, syrup/honey, vanilla extract, eggs) in a separate bowl.
Add the wet ingredients to the dry ingredients and stir until combined.
Divide the mixture into 12 muffin cases.
Bake at 350°F for 25-30 minutes until a toothpick comes out clean.
Cool in the tin for 10 minutes then transfer to a wire rack.