Mix the mashed bananas, soy milk and oil together in a large bowl.
Add the flour and baking powder and stir well. Place dough on a floured surface and knead for 3 minutes.
Using a rolling pin, roll dough to a 1/2 inch thickness. Cut into 2 inch wide circles using a cutter or tin can.
Place biscuits on a lightly oiled cookie sheet, bake 20 minutes or until browned. Serve warm.
Makes 35 biscuits.