In a large bowl, combine breadcrumbs and milk, letting it sit for a few minutes to create a binder.
Heat olive oil in a skillet over medium heat and sauté minced onion with a small pinch of salt for about 7 minutes until softened. Add minced garlic and cook for another minute until fragrant. Set aside to cool.
Once the onion mixture has cooled, add it to the breadcrumb mixture along with mayonnaise, parsley, remaining salt, black pepper, and cayenne pepper. Stir to combine.
When the mixture feels cool to the touch, add the egg and ground chicken. Use your hands to gently combine, being careful not to overwork the mixture.
With slightly damp hands, form the mixture into six patties. Chill in the refrigerator for at least 20 minutes to firm up.
For grilling, preheat your grill to medium-high heat and lightly oil the grates. Cook the patties for 6-7 minutes per side, or until the internal temperature reaches 165°F.
If cooking on the stovetop, heat vegetable oil in a skillet over medium heat and cook the patties for the same amount of time until they reach 165°F internally.
Let the burgers rest for a few minutes before serving to allow the juices to redistribute.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently in a skillet or oven to keep them moist.