Choclate Chip Banana Muffins

http://allrecipes.com/Recipe/Chocolate-Chip-Banana-Muffins-2/Detail.aspx

I followed the advise of a couple reviews and switched out the yogurt for sour cream (had no yogurt)
1 Cup White Flour
3/4 Cup Whole Wheat
1/2 White Sugar and 1/2 Brown