Adjust oven rack to center of oven. Preheat broiler to high. Line a large sheet pan with foil and generously spray with cooking spray. Trim fat and cut chicken into 1-½-inch pieces. Pat dry.
In a large bowl, whisk together olive oil, chicken broth, 1 tsp lemon zest, 2 tbsp lemon juice, 2 tsp garlic, red pepper flakes, and Italian seasoning. Add salt and pepper (I use ¾ tsp salt and ½ tsp pepper). Add chicken and toss to coat. Cover and chill for 30 minutes to 1 hour (no longer).
In a second large bowl, stir together Panko, Parmesan, garlic powder, ½ teaspoon salt, and ½ teaspoon pepper.
Use tongs to remove chicken from marinade, letting excess drip off. Add to breadcrumb mixture and gently toss until evenly coated.
Thread chicken onto skewers and place spaced apart on the prepared pan. Press any leftover crumbs onto the chicken. Spray generously with cooking spray. In the fully heated oven, broil for 10–12 minutes (watch closely), or until chicken reaches 160°F and the coating is golden and crisp.
While chicken cooks, melt butter with remaining 1 tsp garlic in a microwave-safe dish. Stir in 1 tbsp lemon juice and parsley.
Drizzle or brush garlic butter over chicken. Serve right away with extra lemon wedges.
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Notes
Note 1: Chicken breasts won’t work the same here. Start with close to 3 pounds of thighs—after trimming all the fat, you’ll have around 2 pounds.Note 2: Use real Parmesan from the fridge section, not shelf-stable. It should be finely grated, like sand—not shredded.Storage: Best eaten fresh—chicken is crispy right out of the oven. Leftovers can be kept in the fridge for up to 2 days, but the coating softens. Reheat in the oven or air fryer.