Banana Muffins with a Crunch
1 banana, chopped 1 cup chopped walnuts 1 cup granola 1 cup melted butter, cooled 1 cup shredded coconut 1 teaspoon baking soda 1 teaspoon salt 2 bananas, mashed 2 cups white sugar 2 eggs, lightly beaten 2 teaspoons baking powder 2 teaspoons vanilla extract 3 cups all-purpose flour ¼ cup banana chips ¾ cup milk