In a bowl, mash the bananas and add all the wet ingredients together. Mix well and set aside.
In another bowl, mix all the try ingredients together. Add the wet ingredients and hand mix all the ingredients together to obtain a smooth batter.
In another smaller bowl, add the topping ingredients and gently rub together the butter and other ingredients with your fingers to obtain a crumble mix.
Spray a muffin pan with a non stick spray and line your muffin tin with muffin paper cups. Fill in 3/4 way through. Top with some crumble mix.
Bake in a pre-heated 375 degree oven for 20-25 minutes.
Remove and set aside at room temperature to cool down.
Serve or store in a zip lock bag and freeze.