2 large onions, sliced
4 tablespoons butter
1/4 cup olive oil
1/4 teaspoon ground cayenne pepper
1 teaspoon kosher salt
1/2 teaspoon black pepper
4 ounces cream cheese, softened
1/2 cup sour cream
1/2 cup mayonnaise
Chopped parsley, optional
In a large skillet over medium-high heat, melt butter and olive oil. Add onions, cayenne pepper, salt, and pepper. Cook for 10 minutes then lower the heat slightly to medium. Cook for 20-30 minutes, stirring occasionally. The onions should be caramelized and a light brown. Set aside and cool.
In a large bowl, combine cream cheese, sour cream, and mayonnaise. Stir in onions. Mix well. Let sit for at least 1 hour to overnight. When serving, let come to room temperature. Top with chopped parsley if desired.