Preheat oven to 350F and line a muffin tin with paper cups.
In a medium sized bowl, mix together the stevia, vanilla, egg, yogurt and oil.
In a separate bowl, whisk the whole wheat flour, baking powder and ground flax.
Gently fold the wet ingredients into the dry ingredients.
At the end, fold in the sour cherries until incorporated.
The batter will be a little lumpy and crumbly, but not over-dry.
Scoop into muffin cups and bake for 20-25 minutes.
Let cool slightly on baking rack before eating.
Enjoy!