Form the ground beef into burger patties, season with salt and pepper, and set aside.
Preheat your air fryer to 375°F (190°C).
Place the patties in the air fryer basket and cook for 8-10 minutes, flipping halfway through, until the patties reach your desired level of doneness.
Slice the pretzel buns in half and place them in the air fryer for the last 2-3 minutes of cooking, toasting them lightly.
During the last minute of cooking, place a slice of cheese on each patty to melt.
On the bottom half of the toasted pretzel bun, add the beef patty with melted beer cheese. Top with caramelized onions, pickles, and a drizzle of mustard. Add the lettuce and place the top bun on.
Serve your Copycat Red Robin Oktoberfest Burgers with your favorite sides and enjoy the flavors of Oktoberfest right at home!