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1
Whisk together the mayonnaise, mustards, hot sauce, cornichons, green onion and parsley in a small bowl and season with salt and pepper, to taste.
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2
Cover and refrigerate for at least 1 hour.
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3
Burger:
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4
Stir together the paprika, pepper, salt, thyme, garlic powder, onion powder and cayenne in a small bowl.
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5
Mold the meat into patties.
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6
Brush with oil, season both sides with salt.
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7
Sprinkle 1 side of each patty with the spice mixture, making sure to rub the spices into the meat, then drizzle with oil before grilling.
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8
Preheat grill to high.
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9
Heat the 2 tablespoons of oil in a cast iron skillet on top of the grates of the grill until it begins to shimmer.
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10
If using cast iron pan, place the burger in the pan and cook until slightly charred and the spices have formed a crust, about 1 1/2 minutes (be careful not to burn the spices.)
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11
Turn the burger over, lower the heat to medium and continue cooking to desired doneness.
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12
If using a grill, grill the burgers on the grates of the grill for about same amount of time.
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13
Top each burger with 2 slices of cheese during the last 30 seconds of cooking, until cheese is melted.
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14
Put the burgers on the buns, top with the ham, some of the onions and some of the mayonnaise sauce and potato chips.
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15
Use a skewer to hold the burger together.