Preheat oven to 350 degrees. Lightly grease muffin pan.
Combine protein powder and 1-to-1 baking mix, fava flour, sugar, baking powder, soda, salt and xanthan gum; mix well for 1 min.
Add to this the water, oil, vanilla, and applesauce and mix for 2 minutes. Fold in the dry cranberries.
Scoop into each muffin holder, about ¾ full.
Combine crumb-topping ingredients and mix well until fully combined. Add crumble to the top of each muffin.
Bake for 30 minutes, or until golden brown and inserted toothpick comes out clean.
Cool at room temperature (freeze for up to 2 months).