Preheat oven to 350°F. Spray 4 (8-ounce) ramekins or small baking dishes with olive oil spray.
Heat olive oil in a sauce pot over medium-high heat. Add ground turkey and brown, crumbling as it cooks, for 7 minutes. Add onion and bell pepper to the skillet and sauté for 3 minutes.
Stir in tomato sauce, corn, cilantro, and cumin. Bring up to a simmer and remove from heat.
Build 4 individual casseroles by layering two cuts of the tortillas on the bottom of each prepared ramekin. Top tortillas with 1⁄3 cup of the turkey mixture. Top the turkey mixture with 1 tablespoon cheddar cheese.
Repeat the last step to create a second layer in each ramekin as you use the remaining tortillas, turkey mixture, and cheese. Bake for 30 minutes or until bubbly and hot.
If you do not have small baking dishes or ramekins on hand, this recipe can also be made in a 9-inch by 5-inch loaf pan.