In a very large mixing bowl, combine the cabbage, carrots, green pepper and onion. Set aside. Cook the bacon in a skillet until crisp. Drain the bacon on paper towels, and reserve the bacon fat in the skillet. Crumble the bacon into small bits and set aside.
Add the mayonnaise and sour cream to the bacon fat in the skillet and whisk until smooth. Whisk in the heavy cream, mustard, chili powder and cumin. Season to taste with salt and pepper.
Mix half of the crumbled bacon into the cabbage mixture. Add the mayonnaise dressing mixture and toss very well to coat the coleslaw thoroughly. Transfer to a large, decorative serving bowl. Top the coleslaw with the remaining bacon and parsley. Serve slightly chilled or at room temperature.