Preheat your oven to 400ºF and grease a baking dish.
In a large skillet over medium heat, add the butter and onions and cook until caramelized, about 10 minutes.
In a large bowl combine the onions, cream cheese, mayonaise, and Parmesan cheese. Top with grated gruyere cheese and bake until the cheese is hot and melted, about 25 minutes. Serve.
Notes
Serve with crackers, french bread, or vegetables.
Keep an eye on the dip, making sure it doesn't curdle in the oven.
Perfect Pairing
Serve this French Onion Dip with Red Starburst Moonshine.
[embed_recipe id='17962']