Preheat: Heat oven to 350°F (175°C). Line or grease a 12-cup muffin tin.
Dry: Whisk whole wheat pastry flour, baking powder, cinnamon, baking soda, and salt.
Wet: In another bowl, whisk eggs, applesauce, melted/cooled coconut oil, maple syrup, nonfat greek yogurt, and vanilla until smooth.
Combine: Fold wet into dry until just combined (do not overmix). Fold in diced apple and grated apple.
Fill: Divide batter among muffin cups (about 3/4 full).
Bake: Bake about 18-22 minutes at 350°F until tops are set and a toothpick comes out clean or with a few moist crumbs. Cool in pan a few minutes, then move to a rack.