Heat a large cast-iron skillet over medium-high heat for 20 minutes.
Gently mix the chuck and sirloin together in a large bowl, making sure not to overwork the mixture.
Combine the paprika, brown sugar, cayenne, coriander, cumin, garlic powder, mustard powder and onion powder in a small bowl. Sprinkle the spice mixture over the beef along with the Worcestershire sauce and fold gently to combine. Form the beef into 4 3/4-inch-thick patties, each about 4-inches in diameter. Sprinkle them generously with salt and a pepper.
Put the patties in the hot skillet (do not press down with a spatula). When the patties are seared and browned on one side, about 3 1/2 minutes, flip and cook on the other side until browned and the burgers are medium-rare, about 3 1/2 minutes more.
Put the burgers on buns and top with coleslaw and serve with potato chips if using.
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