2 lbs. zucchini or summer squash
2 lg. onions
2 lg. peppers
2 c. chopped mushrooms
2 c. shredded carrots
2 c. sour cream or plain yogurt
1 lg. pkg. Mozzarella cheese, grated
2 c. bread crumbs
1/2 c. butter

In skillet with butter, brown onions, then add peppers and mushrooms. Combine remaining ingredients in large mixing bowl. Add skillet contents and mix together. Pour everything into baking dish and bake at 350 degrees for 30-40 minutes. Enjoy!