Beef Taco Casserole

Preheat the oven to 350 degrees F. Coat a 9 inch square pan or 2 quart baking dish with cooking spray.

Heat the olive oil in a large pan over medium high heat. Add the ground beef and cook for 5-6 minutes, breaking up the meat with a spatula.

Add the onion and cook for an additional 3-4 minutes or until onion is translucent.

Stir in the taco seasoning and diced tomatoes. Simmer for 3-4 minutes.

Place a layer of tortilla chips in the bottom of the prepared pan. Spread a layer of refried beans over the top.

Pour the beef mixture over the beans and top with the cheese.

Bake for 15-20 minutes or until cheese is melted. Add toppings if desired, then serve.