Banana-Chocolate Chip Muffins
["1 c. sugar", "1 egg", "1/2 c. butter (room temperature)", "1 c. mashed, ripe bananas (about 2 medium)", "3 Tbsp. milk", "1 c. whole wheat flour", "1 c. unbleached white flour", "1 tsp. baking powder", "1/2 tsp. baking soda", "1/4 tsp. salt", "1 c. chocolate chips", "1 c. chopped walnuts"]
["Preheat oven to 350\u00b0.", "Grease and flour muffin pans or line with paper.", "Mix sugar, egg and butter.", "In separate bowl, combine bananas and milk."]
["sugar", "egg", "butter", "bananas", "milk", "whole wheat flour", "unbleached white flour", "baking powder", "baking soda", "salt", "chocolate chips", "walnuts"]