Preheat oven at 350⁰F/177⁰Place paper cup liners on a six hole 6-ounce muffin pan. Set aside.
In a bowl, mix together banana cake mix, egg, mashed bananas, vegetable oil and water. Stir until well combined.
Fold in walnuts and raisins.
Scoop the muffin batter onto the prepared muffin pan, place cream cheese cube in the center then scoop more batter to cover it up. Top with more walnuts, raisins and chopped cream cheese.
Bake in the preheated oven for 18-25 minutes or until lightly brown.
Cool then serve.