Brussel sprouts with velvety cheese sauce is easy to make. Just cook the Brussels sprouts lightly, make a cheese sauce, put it all together and pop it in the oven for a short bake - of course with some extra cheese baked into the top.
Cook the Brussels sprouts until they are fairly tender. Drain them well. Add the diced celery, cover and set aside. The celery won't cook, but will soften up as the sprouts sit for a bit.
Now make a simple cheese sauce: In small saucepan, melt the butter. Stir in the flour, salt and pepper. Once bubbling, remove the mixture from the heat and stir in milk. Use a whisk to make sure there are no lumps.
Return the sauce to the heat and cook, stirring constantly, until it is thickened. Mix in the cheese and stir until it is melted. Heat thoroughly. Add Brussels sprouts and gently stir into cheese sauce.
Pour the Brussels sprouts and cheese sauce mixture into a baking dish. Sprinkle the top with the extra 1/2 cup of grated cheddar cheese and bake at 350ºF for 15 to 20 minutes or so, until it is all bubbly and the cheddar cheese on top is melted and browned.