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, whisk unsweetened applesauce, milk, eggs, honey or maple syrup, melted coconut oil or butter, and vanilla extract until smooth and fully blended.
04 - Pour the wet ingredient mixture into the dry ingredients. Stir thoroughly until all oats are coated and the mixture is fully incorporated.
05 - Gently fold in your choice of blueberries, diced apples, chopped nuts, mini chocolate chips, or dried fruit if desired.
06 - Divide the oatmeal batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Bake for 22-25 minutes until the cups are set and lightly golden on top. Remove from oven and allow to cool in the pan for 10 minutes before transferring to a wire rack.
08 - While cups cool, mix plain Greek yogurt with honey or maple syrup in a small bowl until smooth and sweetened to taste.
09 - Once oatmeal cups have cooled completely, top each with a generous spoonful of sweetened Greek yogurt and garnish with fresh berries or fruit. Serve immediately or store refrigerated.