Mexican Pizza Casserole

Preheat oven to 350ºF.

In a large skillet over medium-high heat, add the ground beef and onion. Cook until the beef is browned and the onions are translucent, about 6-8 minutes. Drain. Return it to the skillet and add the refried beans, green chilies, tomatoes, taco seasoning, water, and salsa; simmer for about 10 minutes.

In a round 9-inch baking pan, place a tortilla. Spread a layer of the beef mixture on top along with some cheese. Drizzle a little bit of taco sauce over the mixture. Continue to layer. Put cheese and taco sauce only again on the top.

Cook in the oven for 20-25 minutes, until bubbly. Serve with sour cream.