In a large pot, boil the Spaghetti according to the instructions on the package until it is al dente. Drain and set aside.
In a large skillet, gradually heat olive oil over medium heat. Add onion, bell pepper, and garlic, cook for 5 minutes (or until vegetables are soft).
Stir into the skillet; shredded chicken, cream of mushroom soup, diced tomatoes with green chilies, chicken broth, chili powder, cumin, salt and pepper and heat until warmed through.
Add the cooked spaghetti back to the skillet containing the seasoning and sausage mixture. Toss it all together until it is well combined.
Add half of the cheddar cheese and the rest of the pepper jack cheese, and mix until melted and creamy.
Pour the mixture into a greased 9x13 inch baking dish, and top with the leftover half of the cheese.
Preheat your oven to 350°F (175°C) and bake for 20-25 minutes until attempting to get bubbly and golden on top.
When you remove it from the oven, garnish it with fresh cilantro or green onion (if desired), and serve hot.