Preheat oven to 325 degrees F. Cut the tops and bottoms off the onions, peel without cutting through the onions. Use a melon baller or teaspoon to scoop out the middle of each onion about 2 inches.

Soften butter in the microwave for 15 seconds. In a small bowl, combine butter, goat cheese, and crumbled bacon, stir until well combined. Use a teaspoon to equally stuff each onion. Place in a baking dish and cover with aluminum foil. Bake in the preheated oven for 1 hour, or until the onions are soft. Uncover, set the oven to broil, and broil on the middle shelf for 3-5 minutes or until lightly browned on the tops.