Preheat oven to 350°F. Line 18-24 muffin cups with paper liners.
In the bowl of a standing electric mixer, beat melted margarine with the sugar and eggs until pale yellow in color.
Add the bananas and mix until broken down and mashed.
Add the vanilla and mix to combine.
Add the dry ingredients: cake meal, potato starch, baking soda, and salt. Mix to combine.
Add in the chocolate chips and stir by hand so the chips don't break up.
Fill each muffin cup ¾ of the way and bake at 350°F for 15-20 minutes until light brown and the tops springs back to the touch or a toothpick comes out clean (avoiding the chocolate chips, they will be melted).
Recipe by Lil' Miss Cakes at https://lilmisscakes.com/2012/passover-banana-chocolate-chip-muffins