Variations: For more tender onions, you can pre-boil whole, unpeeled onions for 20 minutes prior to baking. As to filling, change it up with different cheeses, herbs, perhaps a bit of olive oil and balsamic vinegar… Another option is to scoop out the center of each onion prior to baking, chop and mix it with a little butter, garlic, and oregano, then cook until soft, about 3-4 minutes. Remove from heat. Stir in ⅓ cup cream and Parmesan cheese, salt and pepper and mix well. Transfer cooked onion mixture back into hollowed centers of the onions, spooning any excess around the bottom of pan and bake as indicated before.