Divide the batter equally between the prepared muffin cups and top with the streusel topping. Bake for 18-20 minutes, or until golden.
Let the muffins cool in the tin for ten minutes before removing and cooling completely on a rack before storing. They can be eaten warm and keep well on the counter in a sealed container for up to three days.
Streusel Topping
Add all of the ingredients to a bowl and mix with a wooden spoon or your hands. I suggest using your hands to more easily incorporate the coconut oil. The mixture should be crumbly once combined.