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Slow Cooker Caramelized Onions & Turkey Grilled Cheese Sandwiches

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I can’t believe Thanksgiving Day is tomorrow! I hope you have the opportunity to celebrate with family or friends near to your heart, a bountiful table, in a warm home filled with love. We will be sharing our first Thanksgiving with A with my baby sister, her husband, their dog, and two friends from our last assignment who just moved here, and I know it will be a wonderful way to begin the Christmas season. I’m really looking forward to it!

Slow Cooker Caramelized Onion Recipe

If you are fortunate enough to have the same, be thankful for your blessings. If you are a public servant spending the holiday at work, thank you for watching over us. If you are a military family with a deployed (or otherwise unable to join you) service member, thank you. I can’t say anything to bring them home, but having been there, I know how you feel and I’m praying with all my heart your family is together again soon, safe and sound. If you have to work retail, I’m sorry commercialism has driven stores to feel the need to open. I wish you nothing but pleasant shoppers and many of those little moments that can make working retail fun. I know I may not personally know all of you who read this, or your individual situation, but whether you get to enjoy Thanksgiving traditionally or not, know I’m thankful for you. I appreciate you, and you are one of the many many blessings I will reflect upon and be very thankful for tomorrow and every other day.

Caramelized onion turkey grilled cheese

Enjoy your Thanksgiving, eat lots of amazing food, and should you have leftover turkey, I hope you’ll try one of the recipes I’ve posted on the blog this past week. 😉

Makeshift sandwich press for grilled cheese

Like my makeshift sandwich press? I refuse to purchase one and this is my solution. It worked beautifully.

We can’t do Thanksgiving leftovers without at least one turkey sandwich or sandwich variation, it’s downright un-American, and this year’s variation in the Godmother household is inspired by my slow cooker. This year, I discovered the wonder of slow cooker caramelized onions. Instead of spending 30-40 minutes near my stove while the onions slowly reach a lovely golden brown, I spend 10 minutes slicing and let my slow cooker do the rest of the work for 10 or so hours while I was free to do a host of other things.

Easy caramelized onions in the slow cooker

I’ve used these onions in sandwiches, pasta, eggs, on crackers, they’re very versatile. While I haven’t tried freezing them yet, I have read that you can, something I may try with a future batch. We just go through onions quickly, but I’m tempted to make a really big batch in my larger crock pot. This “recipe” is so easy! I almost didn’t post it, but the sandwiches were really amazing and the onions just added that perfect finishing touch. Enjoy!

Leftover thanksgiving turkey sandwich with caramelized onions and cheddar on Goodie Godmother recipe blog

Slow Cooker Caramelized Onions
Cuisine: Condiment
Author: Goodie Godmother
The easiest way to make caramelized onions!
  • 3 medium to large sweet onions
  • 3 tbsp olive oil
  • 1/2 tsp salt
  1. Peel and slice your onions very thin.
  2. Toss the onion slices with the olive oil and salt and place into your slow cooker.
  3. Set the slow cooker on low and allow to cook 8-10 hours.
If the onions are not brown enough after 8-10 hours, stir and crack the lid for an hour or so to allow some liquid to escape. If they still need more time after that, cover fully again and check in a few hours.

Caramelized Onion Turkey Grilled Cheese Sandwiches

Caramelized Onion Turkey Grilled Cheese Sandwiches

Yield: 2
Prep Time: 10 minutes
Total Time: 10 minutes


  • 4 slices of bread
  • 1/2-2/3 cup leftover Thanksgiving turkey
  • 4 slices sharp cheddar
  • 1/4 cup slow cooker caramelized onions
  • 1 tbsp butter, divided


  1. Assemble both sandwiches - 2 slices of cheese and 2 tbsp of onions in each. Adjust accordingly to your preferences.
  2. Melt 1/2 tbsp butter in a large skillet over medium low heat.
  3. Place both sandwiches in the skillet and cook until golden brown. Remove from the skillet.
  4. Melt the other 1/2 tbsp of butter in the skillet, then flip the sandwiches and place into the skillet to brown the other side.
  5. Cut and serve warm!

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