Zucchini in Yogurt

4 tablespoons butter
1 medium onion
8 small zucchini, sliced 1/8 inch thick
salt and pepper to taste
1 cup yogurt


Melt butter in saucepan.
Add onion, zucchini, salt and pepper and cook 15 munites, covered, over low heat.
Remove from heat and stir in yogurt.