Crush Corn Flakes in a zip lock bag with a rolling pin.
Combine crumbs and 4 tbsp. melted butter; set aside.
Melt remaining butter in sauce pan over low heat.
Add onion.
Sauté until onion is tender.
Add flour, salt and pepper.
Stir in cream and half and half in 1/8 cup increments.
Increase heat to medium; cook until bubbly and thickened, stirring constantly.
Add cheese; stir until smooth.
Stir in cooked carrots and parsley.
Spread in greased 9x13” baking dish.
Sprinkle with crumb mixture.
Cover casserole with foil.
Bake in 350° oven about 40 minutes.
Remove foil and bake an additional 5 minutes or until bubbly and crumbs are golden.