First pre-heat your oven to 375 degrees
Next heat a large skillet medium-high heat. While the skillet is heating up, shred your chicken and chop the spinach into strips
Next, spray the skillet with cooking spray and add the shredded chicken and spinach to the skillet and stir until the spinach begins to wilt
Next add 1/4 cup of the enchilada sauce and 1/4 cup of shredded cheese. Let come to a gentle bubble, then remove from the heat and set aside
In the casserole dish, put 1 tbsp of enchilada sauce on the bottom of the casserole dish next place 1 of the corn tortillas. Sprinkle with a bit of cheese and top with the chicken mixture
Place the other corn tortilla on top and pour 1/4 cup of sauce on top. Top with rest of the shredded cheese
Repeat this process to make two individual casseroles
Place the casserole dishes on a cookie sheet and put in the preheated oven. Cook time will be approx. 12 minutes or until the top is melted and golden brown
Once done, remove from the oven and top with your favorite toppings (optional)