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Low-carb, keto-friendly balsamic roasted Brussels sprouts and onions with fried eggs for the win. Perfect vegetarian, healthy dinner that's also a great comfort meal on chilly nights. #BalsamicRoastedBrusselsSprouts #RoastedBrusselsSprouts #BrusselsSprouts #LowCarb #BestLowCarbRecipes #HealthyRecipe #VegetarianDinner
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4.15 from 7 votes

Balsamic Roasted Brussels Sprouts & Onions with Runny Eggs

Low-carb, keto-friendly vegetarian dinner of balsamic roasted Brussels sprouts and onions with 2 runny eggs. The Brussels sprouts and onions are caramelized for a fabulous umami savory flavor.
Prep Time15 mins
Cook Time55 mins
Total Time1 hr 10 mins
Course: Vegetarian Dinner
Cuisine: Any
Servings: 2 servings
Author: The Wimpy Vegetarian


  • 2 cups thinly sliced red onions
  • 1 tablespoon unsalted butter
  • 3/4 teaspoon kosher salt, divided
  • 1/4 teaspoon black pepper, divided
  • 2 tablespoons olive oil
  • 1 pound Brussels sprouts, trimmed and sliced in half lengthwise
  • 1 tablespoon garlic paste or finely minced garlic
  • 1 teaspoon fruity balsamic vinegar, I used a tangerine balsamic vinegar
  • 1 cup grated melty cheese, such as Gruyere or Fontina, optional
  • 2 large eggs
  • 1/8 teaspoon celery salt, or more to your preference


  • 1. Preheat oven to 425°F (220°C). 
  • Melt the butter in a cast iron skillet suitable for both stovetop cooking and the oven. Add the onions, 1/4 teaspoon salt and 1/8 teaspoon black pepper. Toss, using tongs, and cook over medium heat until the onions begin to relax. Toss again, and lower the temperature to medium-low. Cook for 20 minutes, or until caramelized. Remove to a bowl.
  • Measure 2 tablespoons olive oil into the pan, and add the Brussels sprouts, and the remaining salt and pepper. Toss to coat, and flip all the sprouts over so that their flat sides are in contact with the pan. They might not all fit, but do this with as many of the sprouts as possible. Cook over medium heat without moving them for 8 minutes. They should be well-seared. 
  • Add the garlic paste, reserved caramelized onions, and balsamic vinegar. Toss well to coat, and add additional olive oil if the pan is completely dry. Cook on the stovetop over medium heat for a few minutes before sliding the skillet into the oven.
  • Roast for 15 minutes. If you plan to cook the eggs in the same pan, remove the pan and spread the roasted vegetables out to create two 3-inch circles on the bottom of the skillet. Pour just tiny bit of olive oil into each circle. Crack the eggs into a ramekins to ensure their yolks are not broken, and slide them into the circular openings in the roasted vegetables. Slide the skillet back into the oven, and bake for 7 minutes for runny eggs. 
  • Remove and finish the dish with a little flourish of celery salt before serving.