Boo4u's Sweet Potato Muffins 1 medium sweet potato (8 oz) 2 cups dry oatmeal 1/4 cup Splenda 2 teaspoons cinnamon 5 egg whites and 1 egg 1 Tablespoon vanilla extract Preheat oven to 350° F. Puncture the sweet potato several times and microwave it for about 8 minutes. Scoop out the orange part and mash it in a bowl. Mix it with the rest of the ingredients. Grease a muffin pan and spoon the mixture into the cups. Bake for approximately 30 minutes.