Pumpkin or Sweet Potato Chocolate Chip Muffins

2 cups sugar

16 ounces pumpkin puree (mashed, without butter, salt, or milk) or 16 ounces sweet potatoes (mashed, without butter, salt, or milk)

3/4 cup milk

3/4 cup oil

2 cups all-purpose flour

1 cup whole wheat flour

2 teaspoons baking soda

2 teaspoons baking powder

1 teaspoon ground cinnamon

1 teaspoon salt

12 ounces chocolate chips (use less if you only have a partial bag)