01 - Preheat oven to 350°F. Line a standard 12-cup muffin tin with paper liners or grease thoroughly with cooking spray.
02 - In a large mixing bowl, whisk together rolled oats, baking powder, ground cinnamon, and salt until evenly distributed.
03 - In a separate bowl, combine unsweetened applesauce, milk, eggs, honey or maple syrup, melted coconut oil or butter, and vanilla extract. Whisk until smooth and fully incorporated.
04 - Pour the wet ingredient mixture into the dry ingredients. Stir with a spatula or wooden spoon until all ingredients are fully incorporated and a thick batter forms.
05 - Gently fold in your choice of blueberries, diced apples, chopped nuts, mini chocolate chips, or dried fruit until evenly distributed throughout the batter.
06 - Divide the oatmeal mixture evenly among the prepared muffin cups, filling each approximately three-quarters full using a spoon or ice cream scoop.
07 - Bake for 22 to 25 minutes, or until the oatmeal cups are set and lightly golden on top. Remove from oven and let cool in the pan for 10 minutes.
08 - Carefully remove the oatmeal cups from the muffin tin and transfer to a wire cooling rack. Allow to cool completely before adding toppings.
09 - In a small bowl, mix plain Greek yogurt with honey or maple syrup until well combined and smooth.
10 - Once oatmeal cups have cooled completely, top each with a spoonful of sweetened Greek yogurt. Garnish with fresh berries or fruit before serving.