14 ounces canned diced tomatoes with chilies (such as Rotel) or petite diced tomatoes, lightly drained
For the Sauce
¼ cup salted butter
1 medium yellow onion, chopped
1 clove garlic, minced
½ green bell pepper, chopped
¼ cup all-purpose flour
1 teaspoon Italian seasoning
1 cup chicken broth
1 cup half and half or light cream
½ cup shredded Parmesan cheese
2 cups shredded sharp cheddar cheese, divided
¼ teaspoon salt, more to taste
¼ teaspoon black pepper, more to taste
Instructions
Set the oven to 375°F and lightly grease a 9×13-inch baking dish.
Boil the spaghetti in salted water until al dente, following the package directions. Drain without rinsing.
While the pasta cooks, prepare the sauce. Melt the butter in a skillet over medium heat. Add the onion, garlic, and bell pepper, cooking until they soften.
Stir in the flour and Italian seasoning and cook for 1–2 minutes.
Slowly whisk in the chicken broth and half and half, adding a little at a time to avoid lumps. Bring the mixture to a boil and let it bubble for about a minute, or until thickened.
Remove from heat and whisk in the Parmesan, 1 cup of the cheddar, and the salt and pepper.
Combine the spaghetti, chicken, sauce, and canned tomatoes. Mix thoroughly, then transfer to the prepared baking dish.
Sprinkle the remaining 1 cup of cheddar cheese over the top and bake for 25–30 minutes, or until hot and bubbling.
Notes
Pasta: Cook only to al dente— it continues cooking in the oven.
Cheese: Pre-shredded cheese works fine, but freshly grated cheddar melts more smoothly. Sharp cheddar gives the dish the best flavor.
Shortcut Sauce OptionCook the onion, garlic, and bell pepper as directed. Add:
¾ pound cubed Velveeta
10 ounces condensed cream of mushroom or cream of chicken soup
Drained Rotel tomatoes
Stir until melted and smooth. Omit the salt and add ½ teaspoon each of onion powder, garlic powder, and black pepper.NutritionCalories: 518kcal | Carbohydrates: 38g | Protein: 22g | Fat: 30g | Saturated Fat: 18g | Cholesterol: 95mg | Sodium: 606mg | Potassium: 377mg | Fiber: 2g | Sugar: 3g | Vitamin A: 970IU | Vitamin C: 18.6mg | Calcium: 425mg | Iron: 2.1mg