Nacho Beef Casserole

Ingredients

• 1 lb lean ground beef
• 1 cup chopped onion
• salt and pepper
• 16 ounces refried beans
• 1 (4 ounce) can chopped green chilies
• 1 cup shredded cheddar cheese
• 1 1/2 cups shredded monterey jack cheese
• 1 cup picante sauce or 1 cup salsa
• 1/4 cup chopped green onion
• 4 ounces sliced ripe olives
• 1 tomatoes, chopped
• mashed avocados or guacamole
• sour cream
• tortilla chips