Preheat the oven to 175 degrees Celsius.
Add pumpkin puree, egg, fiber syrup, milk and stevia drops in a blender and blend until smooth and combined.
Combine oat flour, oats, cinnamon, nutmeg, ginger, cloves, baking powder, baking soda and salt in a bowl and mix until combined.
Add the dry ingredients to the blender and run until you have a thick batter.
Let the batter rest meanwhile you prepare the topping.
Combine all ingredients for the topping in a bowl and mix together using your hands.
Add the batter to 5 muffin tins, filling them 7/8 part of the tins. They don't rise that much.
Top the muffins with the crumble topping.
Bake in the oven for 20-25 minutes, until a toothpick comes out clean.
Let them cool before eating.