Preheat oven to 400 degrees. Lightly spray 2 - baking sheets with non-stick spray. Set aside.
Cut the bell peppers in half, lenghtwise, removing the stem, seeds and any internal white pulp. Place on baking sheets.
For the filling: To a large skillet, add the olive oil and heat over medium high heat. Saute the onion for about 5 minutes or until nearly translucent. Add the ground turkey to the onion and brown until cooked through and white, no longer pink.
Once the turkey is no longer pink, add the beans, corn, salsa and seasoning. Stir. Continue to heat over medium-high heat until the filling comes to a low simmer. Remove from heat.
Spoon in the filling to each pepper half. Once all the peppers are filled, top with a sprinkling of cheese, about 1 tablespoon per pepper half. (optional) Bake at 400 degrees for 20-25 minutes.
Remove from oven and let cook for about 5-10 minutes before serving. Top with cilantro, if desired, before serving.