Cut tortillas into 1-2 inch pieces.

Heat olive oil over medium-high heat. Once oil is hot, carefully add tortilla pieces. Toss the pieces so they are mixed well with the oil. Stir occasionally for 5-7 minutes until the tortillas have become golden brown and slightly crispy. (If needed, drizzle a bit more oil over the tortillas as they are cooking to get them extra crispy.)

Once the tortillas are browned, turn down the heat to medium-low. After about a minute, carefully add the tomato sauce and toss with the tortilla pieces so they are all coated. 

Now, add in chicken and cheese. Mix well until the cheese has melted. Remove from heat. Serve immediately and add your toppings of choice!