In small bowl, combine flax egg ingredients and let sit for 5 minutes.
Preheat oven to 350 degrees and line a 12 muffin pan with paper liners (or spray well with cooking spray).
In another small bowl, whisk together applesauce, brown sugar, banana, pumpkin and vanilla extract. Fold in flax egg.
Sift together your gluten free flour, salt, baking powder and baking soda.
Stir gently into your wet ingredients and mix until combined (but don't over mix)
Fill prepared muffin pan. (mixture makes about 10 muffins)
Bake at 350 degrees for 20-25 minutes.
Store in fridge.