01 - Preheat oven to 350°F. Line a standard 12-cup muffin tin with paper liners or grease thoroughly with nonstick 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 incorporated.
04 - Pour the wet ingredients into the dry ingredients. Stir thoroughly until all dry oats are moistened and the batter is uniform.
05 - Gently fold in your choice of blueberries, diced apples, chopped nuts, mini chocolate chips, or dried fruit until evenly distributed.
06 - Divide the oatmeal mixture evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Bake for 22 to 25 minutes, or 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 to cool completely before adding toppings.
09 - In a small bowl, mix plain Greek yogurt with honey or maple syrup to desired sweetness.
10 - Top each cooled oatmeal cup with a spoonful of sweetened Greek yogurt. Garnish with fresh berries or sliced fruit and serve immediately.