Gently oil grill grates with a avocado oil to avoid sticking.
Place 6 frozen burger patties into the preheated grill.
Cook for 6 minutes per side or until a minimum of 160°F with an instant-read meat thermometer.
Place a slice of the 6 slices American cheese onto each patty, close the lid and heat for an additional minute or until cheese begins to melt.
Spread mayonnaise on the bottom of each 6 burger buns, top with Romaine lettuce, Roma tomatoes (sliced thin), sliced raw yellow onion, ketchup, spicy brown mustard, and pickles.
Top with top bun and serve.
Notes
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I'm not a registered dietitian, but I strive to provide the most accurate nutritional values. Any nutritional data I provide is an approximation. Actual dietary information can vary based on ingredients and portion sizes.