Preheat your oven to 350 degrees.
In a large Dutch oven set to medium-high heat, melt the butter.
2 tablespoons butter
Then, add the onion and bell pepper and cook until softened. This should take about 6 minutes, stirring often.
1 onion, 1 green bell pepper
Reduce to medium heat. Add the tomatoes and Velveeta cheese product to your cooked vegetables and stir until the cheese is melted.
1 can diced tomatoes with green chiles, 8 ounces Velveeta
Add the soup, sour cream, chicken, and seasonings. Stir to combine.
1 can store-bought or homemade cream soup, ½ cup sour cream, 3 cups shredded chicken, 1 teaspoon chili powder, ½ teaspoon ground cumin, 1 teaspoon Ranch Seasoning Mix, kosher salt and black pepper to taste
Fold the cooked macaroni into the sauce mixture.
8 ounces elbow macaroni pasta
Spoon mixture into a lightly greased 10-inch cast-iron skillet or 9x13 casserole dish. Top the casserole with cheese.
1½ cup Monterey jack cheese
Bake in the oven for about 25 to 30 minutes or until the cheese is melted and the edges are bubbling.