Preheat the oven to 350 degrees F (175 degrees C). Lightly coat a 9x13-inch baking dish with cooking spray.

Spread 1/2 cup salsa on bottom of prepared baking dish; cover with a layer of corn tortillas. Cover entire bottom of dish; tear tortillas to fit any empty spaces.

Spread 3/4 cup refried beans on tortillas; top with corn, 1 cup salsa, and 1 cup cheese. Add another layer corn tortillas. Spread remaining 3/4 cup refried beans on tortillas; top with chicken, 1 cup salsa, and 1 cup cheese. Add another layer corn tortillas; pour remaining 1 1/2 cups salsa over top, then sprinkle with remaining 1/2 cup cheese.

Bake in the preheated oven, 20 to 25 minutes.