In a large bowl, combine ground beef with kosher salt and black pepper. Mix gently to avoid overworking the meat.

Divide the mixture into six portions and shape each into a 1-inch thick patty.

Heat a cast iron skillet over medium-high heat with canola oil until shimmering.

Cook patties for 3-5 minutes on one side, then flip and cook for another 3-5 minutes.

Add a slice of American cheese on top during the last minute of cooking.

In a separate bowl, whisk together mayonnaise, ketchup, dill pickle relish, and Dijon mustard until smooth.

Cut the brioche buns in half and toast in the skillet until golden brown.

On the bottom half of each toasted bun, place a cheeseburger patty and spread on the burger sauce.

Top with lettuce, tomato, red onion, and dill pickle chips, then close with the top bun.