Preheat a lightly greased griddle over medium to medium-high heat.
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, and divide the slices of cheese evenly over the top of the patties. Meanwhile, place the hamburger buns, cut sides down, onto 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.