Step 1

Preheat the oven to 350 F. Arrange a rack in the middle of the oven.

Step 2

Place the taco shell pieces in the bottom of a 9-by-13-inch casserole dish. Press down to flatten.

Step 3

In a large saute pan set over medium-high heat, heat the oil until it shimmers, about 1 minute. Reduce the heat to medium. Add the onion and sauté for 3 minutes until the onions are translucent. Add the taco seasoning and cook for 1 minute. Increase the heat to medium-high heat. Add the turkey and cook for 5 to 7 minutes, breaking up with a spatula. Reduce heat to medium.Stir in the green chiles and the beans.

Step 4

Transfer the mixture to the casserole dish. Top evenly with the cheese and bake for 15 minutes, until the cheese is melted.

Step 5

Remove the casserole from the oven and garnish with toppings.