Hot Caramelized Onion Dip recipe

1 tablespoon butter
1 tablespoon oil
4 large sweet onions, sliced
1 4 ounce package of cream cheese, softened
1/2 cup mayonnaise
1/2 cup Parmigiano Reggiano, grated
Pepper to taste

Melt the butter and heat the oil in a large skillet. Add the onions and slowly caramelize on over medium-low heat for about 1 to 3 hours. Mix skillet contents and remaining ingredients and place in a baking dish.

Bake in a preheated 350 degrees F oven until the top is nicely browned, about 30-50 minutes.