Spaghetti Casserole Bake

Ingredients

• 1-1/2 pounds ground beef
• 1 cup chopped green pepper
• 1/2 cup chopped onion
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 1 teaspoon minced garlic
• 3 cans (14-3/4 ounces each) spaghetti in tomato sauce with cheese
• 1 jar (6 ounces) sliced mushrooms, drained
• 1 can (2-1/4 ounces) sliced ripe olives, drained
• 2 cups shredded cheddar cheese
• 1 cup grated Parmesan cheese