Preheat oven to 350 degrees.
Grease your glass loaf pan with butter and sprinkle a bit of brown sugar in there too.
Sift the dry ingredients (flour, cake spice, salt, baking soda) into a bowl and set aside.
Cream the butter and brown sugar together in your mixer until nice and fluffy, about 3-5 minutes on medium.
Add mashed bananas, canned pumpkin and vanilla to butter mixture. Mix together, then add the dry ingredients until fully combined.
Pour into buttered loaf pan and top with crumbles of brown sugar.
Bake for 55-70 minutes, until bread is brown and finished cooking.