Preheat the griddle.
Season the onions with Essence, salt, and pepper. Add the onions to the griddle and cook, stirring until wilted, about 8 minutes.
Lightly season the patties on both sides with the Essence, salt, and pepper. Place the patties on the hot griddle and cook for 3 to 4 minutes. Flip the patties, add 1 slice of cheese to each, and continue to cook. Meantime, place the hamburger buns, inside down, on the griddle, and cook until warmed through and lightly toasted, about 2 minutes. Place one toasted bun on a serving plate. Place one patty on the bottom bun, spoon chili on top of the patty, and top with a second patty and more chili. Place a portion of onions on the chili and top with bun. Repeat with the remaining ingredients, and serve immediately.