Homestlye Chicken Noodle Casserole

In a large saute pan, (or you can use a skillet or even a Dutch oven) melt 2 T. butter over medium heat. Add the onion and carrots, cook, stirring frequently until the onion is softened, 5-7 minutes. Add the sauteed veggies to a bowl, set aside. Add the remaining 2 T. butter to the now empty skillet. When the butter is melted add the flour to the pan and cook, stirring constantly for 1 minute. Slowly add the half n half and chicken broth (very important to add a little at a time, whisking thoroughly as you go, to keep the sauce from being lumpy). Bring sauce to a simmer, stirring constantly, stir in the thyme, salt and pepper. Reduce heat to medium-low and simmer until slightly thickened, about 5 minutes, stirring often. Add the sauteed vegetables and chicken breast to the sauce, cover the pan and simmer until the chicken is cooked through 10-15 minutes. Remove the sauce from the heat and place the chicken on a plate to cool.