Preheat your oven to 350°F (175°C).
Cook the spaghetti according to package instructions in a large pot of salted boiling water until al dente, then drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the diced onion, bell peppers, and garlic, and sauté until softened (about 5 minutes).
In a mixing bowl, combine the shredded chicken, cream of mushroom soup, cream of chicken soup, chicken broth, and 1/2 cup of cheddar cheese. Stir until well mixed.
Add the cooked spaghetti to the chicken mixture and gently stir until combined. Season with paprika, salt, and pepper to taste.
Transfer the mixture into a greased baking dish and top with the remaining 1/2 cup of cheddar cheese.
Bake in the preheated oven for 25-30 minutes or until the cheese is bubbly and golden brown on top.
Remove from the oven and let it cool for a few minutes before serving.