Banana Walnut Muffins with Crumb Topping

Ingredients

Muffins

2 ripe bananas
3/4 cups sugar
3/4 cup butter
3 eggs
2 cups of flour
1 tsp baking powder
1 tsp baking soda
1 tsp salt
1 cup walnuts

Crumb Topping

4 tbsp sugar
4 tbsps flour
1 tbsp ground cinnamon
2 tbsps butter
2 tbsps finely ground walnuts
1/2 tsp salt