In a saucepan add the butter, heat, add the onion, garlic, bell pepper, coriander and cook for 2 to 3 minutes. Add the tomato sauce and cook for 3-5 minutes. Add the shredded turkey and season to taste.
Heat the oven to 350 degrees. Grease the casserole and place half of the gouda cheese on the bottom, add the turkey stew and cover with gouda cheese and bake for 20-25 minutes.