In a Dutch oven, combine the first 6 ingredients. Cook and stir over medium heat until heated through, 8-10 minutes.
Combine flour and milk until smooth. Stir into pan. Bring to a boil; cook and stir until thickened, about 2 minutes. Remove from the heat; stir in cheese until melted. Top with parsley.
Health tip: To make lighter versions of favorite recipes that call for cheddar cheese, try using less cheese but switch to sharp cheddar. It’s more flavorful, so you’ll still get a lot of cheddar goodness.