Prep your pan and oven: Heat the oven to 350°F (175°C). Line a 12-cup muffin pan with paper liners or lightly coat with cooking spray.
Make oat “flour”: Pulse the rolled oats in a blender or food processor 10–15 seconds until coarse, like fine breadcrumbs.
You want texture, not a powder.
Combine dry ingredients: In a large bowl, whisk the processed oats, flour, baking powder, baking soda, cinnamon, and salt.
Mix wet ingredients: In a separate bowl, whisk the applesauce, Greek yogurt, almond milk, egg, vanilla, and maple syrup until smooth.
Bring it together: Pour the wet mixture into the dry ingredients. Stir gently until just combined—no dry streaks, but don’t overmix.
Fold in the apple: Add the diced apple and fold until evenly distributed. The batter will be thick; that’s ideal for tender muffins.
Portion the batter: Divide into 12 muffin cups.
For a light crunch, sprinkle a tiny pinch of turbinado sugar on top of each (optional).
Bake: Bake 14–17 minutes, or until a toothpick comes out with just a few moist crumbs and the tops spring back.
Cool: Let the muffins rest in the pan for 5 minutes, then transfer to a wire rack to cool completely. This helps set the crumb and keeps them from turning gummy.
Enjoy: Serve warm or at room temp. They pair well with tea, coffee, or a smear of almond butter if you have extra calories to spend.