In another bowl mix mashed bananas, sugar,18%cream, vegetable oil, egg yolks, and vanilla together.

Add wet ingredients to dry ingredients and stir until ingredients are mixes well then fold in the walnuts.

Grease muffin tins and fill 3/4 full,

Bake at 400° for 7 min. Then reduce the temperature to 350° for 15min or use a toothpick to test that they are cooked there should be no batter sticking to the toothpick. Then place on a cool rack.