1. Use Greek yogurt or buttermilk in place of sour cream; add 0.5 cup mini chocolate chips to batter for extra richness; swap pecans for walnuts or omit nuts; for a 9 by 13 inch pan bake thicker cake 25 to 30 minutes and scale icing to taste; store airtight up to 3 days or refrigerate 5 days and bring to room temperature before serving