Made from three different cheeses and sweet onions, this French onion cheese dip is a sure-fire winner! When served with crostini, the pairing is the perfect appetizer for New Year's or any other party!
In a 12-inch skillet melt the butter over medium-low heat. Add the sliced onion and salt. Sauté over medium-low, stirring occasionally until the onions are caramelized with deep color, 20-25 minutes. Remove from the heat.
To the warm the caramelized onions, add the cream cheese. Stir the cream cheese into the onions until it is melted and smooth. Next, stir in the Greek yogurt, balsamic vinegar, garlic powder, Brie cheese, Gruyere, and Parmesan cheese.
Stir to combine and pour into an 8-inch skillet or baking dish. Bake in the preheated oven until the cheeses are melted and warmed through, 5-6 minutes. Remove from the oven and serve with crostini.
For the crostini
Slice the baguette ½-inch thick. Lay in an even layer on baking sheets and drizzle or brush with olive oil. Sprinkle with salt and pepper.
Bake in the preheated oven until the bread is slightly browned and toasted, 6-8 minutes. Remove from the oven and set aside to cool until ready to serve.