Slow Cooker Caramelized Onions
Prep time
Cook time
Total time
Serves: 1 cup
  • 3-5 very large onions (baseball sized), sliced (see photo and description in post)
  • 3 tbs olive oil -OR- melted unsalted butter
  • ½ tsp kosher salt
  • ¼ tsp sugar
  • pinch of white pepper
  • 1 small sprig fresh thyme (optional)
  1. Mix sliced onions with all the ingredients in a large bowl--mix up well so the onions are coated with the oil/melted butter.
  2. Place in a 4-6 quart slow cooker (see NOTES)
  3. Cook on low 10 hours, stirring every so often if desired.
  4. For deeper color, cook an additional 2-3 hours on low with the lid ajar.
Choose the correct size cooker--the cooker must be at least ½ full with raw onions. If you use too large a cooker, the onions (like anything else) will burn and overcook. If you only have a large-size crock pot, double or triple the recipe. THESE FREEZE WELL so if you have to make a lot, you'll always have on hand.
Recipe by The Midnight Baker at