Preheat oven to 350°F (175°C).

Brown ground beef in a skillet over medium heat.

Add chopped onion to the skillet and cook until softened.

Drain any excess grease from the beef and onion mixture.

In a large bowl, combine cream of mushroom soup, cream of chicken soup, milk, red chili sauce, diced Ortega peppers, chopped olives, and the browned beef and onion mixture.

Mix well to ensure all ingredients are evenly distributed.

In a wide casserole dish, begin layering tortillas on the bottom.

Spread a layer of the beef mixture over the tortillas.

Sprinkle a generous layer of grated Cheddar cheese over the beef mixture.

Repeat the layers of tortillas, beef mixture, and cheese, ending with a layer of cheese on top.

Bake uncovered for 50 minutes.

Cover the casserole with foil and bake for an additional 10 minutes.

Let cool slightly before serving.