Ginger's Best Sausage & Squash Casserole

Ingredients

• 2 pkg. frozen squash, cooked &drained
• 1 stick of butter
• 1 cup onion, finely chopped
• 1/4cup bell pepper, finely chopped
• 3/4 cup grated extra sharp cheddar cheese
• 3/4 pound bulk sausage, browned & drained
• 1/4 cup parmesian cheese
• 1 can water chestnuts, drained & chopped
• 1 egg, beaten
• 1 tsp. sugar
• 1/2 cup mayonnaise
• 3 Tbls.Progresso Italian bread crumbs
• 1/3 tsp. oregano
• 1/4 cup milk
• salt & red pepper to taste
• Bread crumbs fo topping