Good-Cooking - Eggplant Casserole

Ingredients

• 1 (1 1/2 pound) eggplant
• 6 tablespoons butter
• 2 onions, sliced
• 3 sliced tomatoes (fresh) or 1 1/2 cups canned tomatoes
• 1 cup grated cheese
• 1 teaspoon salt
• Pepper, to taste
• 1 cup finely crushed bread crumbs
• Mushrooms (optional)