Caramelized Onion and Bacon Gratin

There is something to be said about the smell of caramelized onions, and it is not unusual in my house, to slowly cook caramelized onions at least once a week. I love the low and slow process of watching delicious onions turn into a great dark brown color, which is just packed full of flavor. I often place caramelized onions on pizza, sandwiches, and baked potatoes, but this past week, I wanted to do something different, so I can up with the idea of making a caramelized onion gratin.

Caramelized Onion and Bacon Gratin

You might have seen my scalloped potatoes recipe before, and obviously this recipe is similar to that, but packed with a few extra goodies. This takes a bit of prep work, but well worth it, and is a perfect side dish to a holiday dinner.


  • 5 whole yukon gold potatoes, cleaned, and sliced very thin
  • 10 slices of good bacon, cooked and crumbled, bacon grease reserved
  • 3 large onions, thinly sliced
  • 1 tbsp unsalted butter
  • 3 cloves of garlic, minced
  • splash of worcestershire sauce
  • 3 scallions, thinly sliced
  • 1/2 tsp salt, pinches for each layer
  • 1/2 tsp black pepper, pinches for each layer
  • 1/2 cup of roasted red bell peppers
  • 1/2 cup of half and half
  • 1 cup of Monterey jack cheese
  • 1/2 shaved parmesan cheese
  • 4 sandwich size slices of colby jack
  • pinch of red chili flakes
  • cooking spray

Begin preparing all of your ingredients. Slowly cook the bacon. Once the bacon is cooked, remove from the pan, let them drain on some paper towel, then crumble. Next, toss your onions into a bacon skillet with the butter and continue to cook on medium heat, cooking for nearly 35-40 minutes. Be careful not to burn the onions, so stir every 5 minutes or so. Towards the end, toss in the garlic, and the worcestershire sauce. Mix well.

During this time, slice your potatoes really thin. Spray a bit of cooking spray on your baking dish, or gratin pan if you have something of that sort. Get your cheeses ready as well.

Caramelized Onion and Bacon Gratin

Once the onions are caramelized, preheat your oven to 400 degrees. Now is the time to begin layering your gratin. Add a layer of potatoes to the bottom of the pan, season with a bit of salt and pepper, then top with some of the crumbled bacon, the monterey jack and parmesan cheeses, some of the caramelized onions, as well as some of the roasted bell pepper. Repeat this process two more times. Pour the half and half around the perimeter of the dish, shower the top with the green onions, then top with the colby jack cheese, and sprinkle a pinch of red pepper flakes on top. Cover with aluminum foil, and bake in the oven for 40 minutes.

After the 40 minutes, remove the foil, and cook for another 40 minutes, uncovered. This will help get things nice and golden and melt the cheeses in all of the right places, building up another layer of flavor.

Remove, and let cool for about 10 minutes before slicing into it.

This caramelized onion and bacon gratin knocks it out of the park. Really rich, and really comforting, this is a great side for any meal. Hope you enjoy.

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Dax Phillips

Thank you for visiting my website. Truly, I do appreciate it. My free time and stress reliever is cooking for my family, friends, and everyone in between. The recipes you find on this site are those that I have either created, been part of, or those that I simply enjoy and have made my own in some shape, form, or other. My focus has always been on comfort food, because at the end of a long work day, you want something comforting. I currently am the father of three children, and married to a wonderful wife of thirteen years. There is nothing fancy with these recipes, just simple, and I will admit, not so simple ingredients, and a simple kitchen corner I can call my own. I learned early on that cooking and bringing family together was very important. After all, this notion of being together at dinner time was instilled early on by my parents. There are many memories of being in the kitchen with my parents, watching them cook, or preparing meals, or those home cooked smells while waiting for dinner. My parents who worked full-time, always had home cooked meals during the week, with the exception of Friday nights where we would enjoy a Wisconsin fish fry, and often on late afternoons on Sunday, where we would order Ann's pizza. I tend to cook by making things up. As a home cook, I think you have to take chances, and add or subtract ingredients that make up a dish, and make them your own. Remember to taste, and taste often. If a dish has potential, try it again, and make it your own. You should also note that I do not count calories, or break down recipes into grams of anything. To me, that's a bit boring. My philosophy is that if the food is good, eat it, and eat it in moderation. Life is just too short not to enjoy good food. Commonly Asked Questions: Can I use your photography/content on my website/blog? Please do not redistribute my photography or recipes without my permission. All of the recipes and photography on this website are my own unless noted, and is subjected to copyright  If you’d like to use a photograph or a recipe, please contact me for permission. Will you review my product/book/site? I am available for recipe development, food photography and/or styling, travel/press events, product reviews, brand promotion/ambassador, and sponsored posts. If you are interested in working with me, or if you have a question/comment regarding a recipe or about my blog, please send me an email.

3 thoughts to “Caramelized Onion and Bacon Gratin”

  1. Wow, this looks amazing! Just found your site via Tasty Kitchen, and you will definitely be added to my favorites. Wish you had a printing option though!

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