For the burger sauce, mix all ingredients in a small bowl. Cover. Set aside until ready to serve.
For the burgers, mix ground beef and 1 tablespoon of the seasoning in medium bowl until well blended.
Combine:
Divide meat evenly into 8 portions and shape into patties. Sprinkle patties evenly with remaining 1 teaspoon seasoning.
Create:
Place burgers on grill over medium heat. Smash burgers slightly. Cook 4 minutes, then flip.
Top 4 of the burgers with cheese. Close grill; cook 3 minutes or until cheese is melted and burgers are cooked through (internal temperature of 160°F).
To assemble burgers, spread sauce on cut-sides of rolls. Place burger with cheese on bottom roll. Add a second burger patty to each. Top with Crispy Fried Onions to serve.