Add all ingredients to slow cooker and toss to combine.
Cook on low for 8 hours.
Check onions every few hours, if there is too much liquid in the slow cooker, vent the lid to allow some moisture to escape.
Serve immediately.
Notes
Cook on High: For quicker slow cook caramelized onions, cook on high for 5-6 hours. Disclaimer, cooking on low will yield better results.
Chopping Onions: To prevent eye irritation or crying when chopping up onion, keep a wet paper towel next to the cutting board, simple try but makes huge difference.
Stove Top: If you don't have a crockpot but still want to easily make caramelized onions in a pinch, try this recipe and technique to achieve similar results.
Caramelized Onions for Burger: There is nothing better than a burger with caramelized onions, it is a classic that everyone loves and great way to use this recipe.