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hot caramelized onion dip on marble with crostini
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4.92 from 36 votes

Jammy Hot Caramelized Onion Dip with Gruyere

Golden and bubbly hot caramelized onion dip. The sweet, jammy caramelized onions combined with four different types of cheeses makes the most delicious dip! Caramelize the onions in a pan and then let everything cook together in the slow cooker or the oven. Top it with a little shredded gruyere, and the crowd will go WILD!
Prep Time10 minutes
Cook Time1 hour 30 minutes
Total Time1 hour 40 minutes
Course: Appetizers
Servings: 12
Calories: 241kcal
Author: Marzia

Ingredients

  • 2 large onions halved and thinly sliced
  • 1 tablespoon butter
  • 1 tablespoon avocado oil or canola, etc.
  • ½ teaspoon fresh thyme
  • ½ teaspoon onion powder
  • 2 teaspoons granulated sugar
  • teaspoon balsamic vinegar
  • 4 ounces cream cheese softened
  • ½ cup sour cream
  • ½ cup mayonnaise
  • ¾ cup milk
  • 1 tablespoon minced garlic
  • ½ teaspoon red pepper flakes
  • ¼ teaspoon black pepper
  • ¼ cup grated parmesan cheese
  • 4 ounces of brie diced (see notes for sub)
  • 1 cup shredded gruyere see notes for sub
  • prepared crostini for serving

Instructions

  • CARAMELIZE: Heat the oil and butter in a large cast iron skillet over medium heat. Add the onions and let sauté for 5 minutes, stirring frequently. Add the thyme, sugar, and ¼ teaspoon kosher salt and continue to cook for a minimum of 25 and up to 45 minutes on medium-low heat. Stir the onions every 5 minutes so they caramelize evenly. If, at any point, the onions are caramelizing too fast, turn the heat down to low. When the onions are soft and golden, add the balsamic, and allow the onions to soak it in. Remove from heat.
  • TOSS IT IN: Spray the inside of your slow cooker with cooking spray to keep the dip from sticking. Add the onions and all the remaining ingredients except the brie and gruyère to the slow cooker.
  • SLOW COOK: Cover and cook for 2 hours on the high setting. Check and stir once or twice, if possible. Add diced brie cheese and stir to combine. Top with shredded Gruyère, cover, and continue cooking for another 20-25 minutes or until the Gruyère melts. Keep in mind, the cheese won’t form a brown crust in the slow cooker. It will melt and become stringy, though. See below for broiling instructions.
  • BUBBLY TOP: For a bubbly top, add the brie and cook in the slow cooker for 20 minutes. Then transfer the dip to a 2-quart baking dish sprayed with cooking spray. Top with Gruyère and let the cheese melt under the broiler for a few minutes. Serve warm with crostini slices or crackers.
  • OR OVEN: Complete step 1. Add all the ingredients except the gruyere to a bowl and stir to combine. Dump the ingredients out into a 2-quart baking dish. Top with the shredded gruyere and bake in an oven preheated to 375ºF for 45-50 minutes. Check the dip to ensure it’s not browning too much at any point. Broil for the last 45-60 seconds to get that golden crust on top!

Notes

* The recipe can easily be doubled in a 3-quart slow cooker or tripled in a large-sized crockpot. Cooking time may vary for larger batches.
* caramelized onions: can be done up to 48 hours in advance.
* gruyere: can be replaced with shredded white cheddar or provolone cheese for a more economical option!
* brie: can be replaced with another 4 ounces of cream cheese.
* make ahead: cook the dip without the gruyere in the slow cooker. Transfer to a baking dish, cover it, and refrigerate for up to 48 hours before serving. Remove from the refrigerator 1 hour before baking. Top with gruyere and bake at 350ºF covered for30-40 minutes or until everything heats through and the cheese on top melts.

Nutrition

Calories: 241kcal | Carbohydrates: 5g | Protein: 8g | Fat: 21g | Fiber: 0.4g | Sugar: 3g
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