In a medium bowl, whisk together the flour, ginger, cinnamon, nutmeg, baking powder, baking soda, and salt.
Using a separate bowl, whisk together the butter, egg white, stevia, and vanilla.
Add the yogurt. Mix until there are no remaining large lumps. Some small lumps may remain.
Stir in the pumpkin puree and stir to combine.
Add about ½ of the flour mixture to the egg mixture. Stir gently.
Stir in the milk to combine.
Add the remaining flour mixture and stir just until combined. Avoid over mixing.
Using about half the batter, spoon it evening between the 12 muffin cups.
Carefully spoon the filling mix into the center of each batter. Try to avoid any filling seeping to the side of the muffins.
Top with the remaining batter. It is ok if some of the filling shows through.
Bake at 350°F about 20-24 minutes. When done, the pumpkin portion will feel firm when touched. You may also test the pumpkin portion with a toothpick. It will come out clean when they are done.
Cool in the cups for 10 minutes before transferring to a cooling rack.½