If your onion sits level, you can leave it alone. Use a paring knife to cut a 1-inch deep cone into the top of the onion. In fact “a red onion can lose about 20% of its quercetin and almost 75% of its anthocyanins if it is ‘overpeeled. What I am posting here is an adaptation of the adaptation I found there of a recipe for Bake , uncovered in 350 degree oven for about 45 minutes. cheddar cheese - vidalia onion bake Place onions in 2-quart casserole that has ... cheese sauce over onion . Surprisingly, baked sweet onions are a tasty, healthy side dish on their own. Peel your onion, leaving the root intact. Onion slices on hamburgers, minced onions on hot dogs or chili, and chopped onions in spaghetti sauce or meatloaf -- these are the ways that many people use onions, in or on something else. Uncover and sprinkle each I found this recipe on The Splendid Table website. Remove from oven. Insert a vegetable, chicken, or beef bouillon cube into the hole. '” By baking the onions in their peels, you will be more likely to eat all of the onion, rather than tossing the nutritious part just below the peel. If not, cut a thin slice off the root to create a flat bottom. Cover and bake 50 to 60 minutes or until onions give slightly when the edges are squeezed together between your fingers.