Preheat broiler to high for 5 minutes. Line a baking sheet with foil paper, set aside. Wash the peppers and place onto baking sheet. Peel and slice the onion in quarters. Place the veggies under the broiler for 14 to 18 minutes, turning halfway through cooking time. Remove from oven and cover with a kitchen towel. let cool.
Once cooled, remove blistered skins from peppers, as well as seeds and stems. Slice the peppers and onions into thin strips and set aside.
In a large skillet, heat 1 tablespoon of olive oil to medium. Add the onions and peppers and cook just until warm.
Reduce the heat and stir in the milk, crema and white pepper to pepper mix. Cook on low heat for a few minutes or until it gets thick. Add in the cheese and cook just until slightly melted .Taste for salt and pepper, remove from heat. Serve with chips, warm tortillas and your favorite salsa.