Start the onions on the griddle or in a skillet with 2 Tablespoons of butter. Cook on medium heat until soft and caramelized.
Sweet Burger Sauce
In a small bowl, stir together the ketchup and brown sugar. Microwave for 10-20 seconds or until the sugar dissolves. Set aside.
Forming Burger Patties
Divide the pound of hamburger into 3 equal-ish balls for burger patties.
Pack the ground beef enough to keep it together in a patty, but avoid over handling or handling it roughly. Avoid destroying fat pockets in the ground beef.
Flatten the patties to a little less than ½ inch thick. Season both sides with garlic salt and pepper. Set aside.
Preheat the electric griddle to 400 degrees. If you are cooking in the skillet, preheat on a medium-high flame.
Cooking Burgers
Check to see that your cooking surface is hot enough, by dropping a few drops of water on the pan. If it sizzles, it's ready!
Place the burger patties on the hot griddle with space between each patty. Now LEAVE THEM ALONE and let them get a nice, brown, crisp crust on the bottom.
Gently lift the edge of the burger when the sizzling has slowed down to see if the bottom is browned and crisp. If so, flip.
Allow the burger to cook on the second side without disturbing the patty, and cook until desired doneness.
Add Cheese and Toast Buns
Place buttered buns with the buttered side down on the hot griddle and allow to brown.
When the inside is browned, flip them over and add the American Cheese to the bun.
Top the burger patties with the Colby Jack/Monterey Jack cheese and allow it to melt.
Assembling the Sweet and Spicy Bacon Burger
Add the grilled onions to the cheeseburger, top with bacon, and the Sweet Burger Sauce.
Top with a few slices of jalapenos (or peppers of your choice).