One-Ingredient Slow Cooker Caramelized Onions

Don't want to stand over a frying pan with softly fried onions? Just toss it in a slow cooker, let it sit for 8 hours or overnight, and you'll get deliciously tender and sweet caramelized onions that are perfect for making sauces, side dishes and salads, layering on sandwiches, and more.
Add the chopped onion to the slow cooker; cover and cook over low heat for 8 hours. Season with salt, black pepper and thyme, or if desired. Serve on burgers, steaks, or use as a base for soups, sauces, or pate sauces.