In a large skillet, heat oil over medium - medium high. Add tortilla pieces and cook slightly brown and crispy.

Remove tortillas from pan and place on a large plate lined with paper towels.

Add onion and beef to same skillet. Season with salt and pepper. Cook over medium heat until beef is fully cooked and onions are tender. Drain off any grease.

Add enchilada sauce to the beef. Stir to combine and allow to simmer for 2 minutes.

Add tortillas pieces to the mixture and stir until well combined. Top with cheese.

Serve topped with sour cream and olives. Serves 6.