Preheat the oven to 400 FIn a large bowl place the bananas and sugar and mix them with hand mixerAdd vanilla, sour cream, and oil and mix until combinedAdd one egg at the time until all 3 are incorporatedIn a separate bowl combine dry ingredients: flour, baking soda and saltAdd dry ingredients to banana mixture until incorporatedAt the end fold in the chocolate chipsFill out the muffin sheet with muffin paper caps and spray with cooking sprayScoop muffin batter into the muffin cups â…” fullAdd couple of chocolate chips and banana slice on the top of each muffinBake for 20 minutes