Combine dressing ingredients in a small bowl and whisk together to combine.
Preheat grill or skillet over medium-high heat. Cook burgers until no longer pink, about 5 minutes per side. Melt cheddar slices on the burgers.
Evenly divide lettuce between four plates. Top with tomatoes, onions, and pickles. Slice burger patties and place them on top of each salad. Drizzle with dressing and enjoy.