Combine flour, baking powder, salt, and cinnamon in a bowl. Add greek yogurt and gently combine until dough is solid and uniform. Flour outside of dough so it's easier to handle (it can be sticky) and cut into 4 equal parts. Cut each part into 8 cubes. Set aside.
Peel and cut apples. Combine sugar mix ingredients and toss apples in 2 tbsp of sugar mix, set aside.
Toss dough chunks in remaining sugar mix.
Spray muffin pan well and put 3 dough pieces in each. Layer on a bit of apple mix, then top with additional dough to round out 8 muffins. Spray tops well with cooking spray.
Bake at 375 for 20-25 minutes, until lightly golden and caramelized on the outside. Let cool slightly and enjoy warm. (Optional: make a basic glaze with powdered sugar and a bit of milk for some extra sweetness, track points/calories accordingly)