Sausage Squash Casserole

1 lb. sausage
1/2 cup chopped onion, more if you like
1/4 cup chopped green bell peppers, more if you like
3 large yellow squash, peeled, sliced, cooked and drained
3 cups cheddar cheese
2 1/2 cups dry stuffing mix
1 carton (6 oz.) plain yogurt
1/2 French fried onioins

Preheat oven to 350 degrees.  In a large skillet brown sausage, onions and peppers.  Pour off drippings.  Stir in squash, 2 cups cheese, 2 cups dry stuffing and yogurt.  Mix well and pour into a 2 quart casserole dish sprayed with non-stick spray.  Bake 20 minutes.  Remove from oven and top with 1 cup cheese, 1/2 cup stuffing and French fried onions.  Bank another 5-10 minutes or until cheese melts.  (Watch French fried onions so they don't burn.  If they start browning too quickly, cover dish loosely with foil.  Serves 6-8 as a main dish.