Zucchini Muffins

3 cups flour
1 tsp baking soda
1/4 tsp baking powder
1 tsp salt
1 tsp cinnamon
2 cups sugar
3 eggs, beaten
1 cup oil
1 tsp vanilla
2 cups grated zucchini
1/2 cup (heaping!) sour cream
1 cup chopped nuts, or some choc chips

Mix dry ingredients.  Thoroughly mix in the rest of the ingredients.  Bake at 350 for around 25 minutes.  Test with a toothpick.