Get ready to meet your new secret weapon in the kitchen! These slow cooker caramelized onions are the ultimate flavor bomb, effortlessly transforming any dish from simple to sublime. Imagine them piled high on a juicy steak, a gourmet burger, or a perfectly roasted chicken. This set-it-and-forget-it recipe makes a big batch, perfect for freezing, so you can have that incredible sweet and savory flavor on hand whenever a craving strikes.
Ingredients
• 2 tablespoons / 30 ml olive oil
• 6 large sweet yellow onions, thinly sliced
• 4 tablespoons / 57 g butter, cubed
• Salt and freshly ground black pepper, to taste
Instructions
1. Prepare the Slow Cooker: Rub the 2 tablespoons of olive oil all over the bottom and sides of a large slow cooker stoneware insert.
2. Add : Place all the thinly sliced onions into the prepared slow cooker. Dot the top of the onions evenly with the cubes of butter.
3. Cook Low and Slow: Cover the slow cooker and cook on the HIGH setting for 5 to 7 hours, or until the onions are a deep golden brown, soft, and jammy.
4. Season and Serve: Once cooked, season to your liking with salt and pepper. Stir well to combine and serve immediately or store for later.
Nutritional Information
• PER (¼ CUP) SERVING: 57 CALORIES ★ FAT 5 G (78%) ★ NET CARBS 3 G (21%) ★ PROTEIN 0G (0%)
Pro Tips
• For a deeper, richer color, cook with the lid slightly ajar for the last hour to allow some moisture to evaporate.
• Freeze for later! Portion the cooled onions into ice cube trays or small freezer-safe bags. They’ll last for up to 3 months, ready to be dropped into any recipe.
• Add a flavor boost by deglazing the slow cooker at the end. Stir in a splash of balsamic vinegar, red wine, or beef broth and scrape up any browned bits from the bottom.
• Don’t slice the onions too thin. A slice about 1/8 to 1/4 inch thick is ideal, as they will cook down significantly and you want them to maintain some texture.
FAQ
Q: Why aren’t my slow cooker onions getting brown
A: Slow cookers trap a lot of moisture, which can prevent browning. For a deeper, richer color, cook with the lid slightly ajar for the last hour. This allows excess moisture to evaporate, helping the onions to caramelize properly and develop that jammy texture.
Q: Can I cook these caramelized onions on low instead of high
A: Yes, you can cook the onions on the LOW setting. It will take significantly longer, typically around 10 to 12 hours. This method is great for an overnight, completely hands-off approach.
Q: What is the best way to store leftover caramelized onions
A: For long-term storage, portion the cooled onions into ice cube trays or small freezer-safe bags. They can be frozen for up to 3 months. For short-term use, store them in an airtight container in the refrigerator for up to one week.
Q: Do I need to stir the onions while they cook
A: No, one of the biggest advantages of this slow cooker method is that it’s a ‘set-it-and-forget-it’ recipe. You do not need to stir the onions during the cooking process until the very end when you add seasoning.
