Chicken Burgers with Caramelized Onions

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Recipe by: Allison

"Chicken burger with caramelized onions, ham, Swiss cheese, and a sweet/hot mustard! My fiance, Dan, created this delicious burger, so we call it "The Danburger." The flavor is amazing. We serve it with baked sweet potato wedges."

Directions

Coat the bottom of a large cast iron skillet with oil. Turn heat to high and wait until oil is hot but not smoking. Add onions and cook for 1 minute. Reduce heat to low or medium-low. Continue to cook, flipping onions every 8 minutes and adding oil if necessary to keep them moist, until dark and caramelized, 25 to 30 minutes.
While the onions are caramelizing, preheat an outdoor grill for medium-high heat and lightly oil the grate.
Combine ground chicken, bread crumbs, diced ham, egg, bell pepper, onion powder, garlic powder, salt, and pepper in a large bowl. Mix to combine, being careful not to work the meat too much. Form into 4 patties.
Grill on the preheated grill over direct heat until cooked through, 4 to 5 minutes per side, adding a slice of Swiss cheese to each in the last minute. An instant-read thermometer inserted into the center of the burgers should read at least 165 degrees F (74 degrees C).
Spread butter on the inside of the hamburger buns and grill, face-down, until toasty, about 3 to 5 seconds.
Place the patties with cheese on the bottom buns, top with caramelized onions, spread mustard on the top buns, and serve.