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 applesauce, milk, eggs, honey or maple syrup, melted coconut oil or butter, and vanilla extract. Whisk until smooth and fully blended.
04 - Pour the wet ingredients into the dry ingredients. Stir with a spatula or wooden spoon until all ingredients are incorporated and a thick batter forms.
05 - Gently fold in your choice of add-ins such as blueberries, diced apples, chopped nuts, mini chocolate chips, or dried fruit.
06 - Divide the oatmeal batter evenly among the prepared muffin cups, filling each about three-quarters full.
07 - Bake for 22 to 25 minutes until the cups are set and lightly golden on top. Remove from oven and let cool in the pan for 10 minutes.
08 - Transfer the oatmeal cups to a wire cooling rack and allow them to cool completely before adding toppings.
09 - In a small bowl, mix Greek yogurt with honey or maple syrup until sweetened to your taste.
10 - Top each cooled oatmeal cup with a spoonful of sweetened Greek yogurt and garnish with fresh berries or fruit. Serve immediately or store for later.