Otto'S Onion Pie - cooking recipe

Ingredients

3 large onions, thinly sliced (about 3 c.)
3 Tbsp. butter or margarine
1 (10-inch) pie shell, baked for 10 minutes
1 c. milk, divided
1 c. cottage cheese
1 c. sour cream
1 tsp. salt
1/8 tsp. seasoned pepper
3 eggs, beaten
1 Tbsp. flour
1/3 c. grated Cheddar cheese
cooked bacon or ham (optional)

Preparation

First make crust, then spread sauce on it.
Put cheese and pepperoni on it last.
Put it in oven for 10 minutes.