Preheat your griddle or skillet over medium-high heat.

Form ground beef into loose balls (about 6 oz each).

Once hot, smash the beef balls onto the griddle using a spatula and season with salt and pepper.

Cook for about 2 minutes until crusty edges form, then flip and add cheese on top to melt.

In a bowl, whisk together ketchup, mayonnaise, and Dijon mustard for the house sauce.

Toast buns if desired; assemble by layering lettuce and tomato on the bottom bun, adding cheesy patties, drizzling with house sauce, and topping with the other half of the bun.