1Place chicken breasts on a clean cutting board and cover with plastic wrap. Pound to an even 3/4-inch thickness using a meat mallet, working from the center outward to create uniform pieces.
2Cut the flattened chicken into bite-sized nugget pieces, approximately 1 to 1.5 inches each. Pat completely dry using paper towels to remove excess moisture.
3Whisk together olive oil, chicken broth, lemon juice, Worcestershire sauce, and soy sauce in a medium mixing bowl until thoroughly combined. Add salt, garlic powder, onion powder, paprika, and black pepper, stirring vigorously to distribute seasonings evenly.
4Transfer chicken nugget pieces to the marinade, tossing gently to coat each piece completely. Cover bowl with plastic wrap and refrigerate for 1 to 2 hours, turning halfway through marinating time.
5Remove marinated chicken from refrigerator and let stand at room temperature for 15-20 minutes before grilling. This ensures even cooking throughout.
6Preheat outdoor grill or grill pan to medium-high heat (375-400°F). Coat grill grates generously with cooking spray to prevent sticking.
7Remove chicken nuggets from marinade, allowing excess liquid to drip off. Discard remaining marinade. Arrange nuggets on preheated grill in a single layer, leaving space between each piece.
8Grill undisturbed for 3-4 minutes until distinct grill marks form and chicken releases easily from grates. Flip each nugget carefully using tongs and continue grilling for another 3-4 minutes until golden brown with light char marks.
9Check internal temperature with an instant-read meat thermometer; chicken should reach 165°F at the thickest part. Remove from heat immediately once temperature is achieved to prevent drying.
10Let grilled nuggets rest on a clean plate for 2-3 minutes before serving. This allows juices to redistribute throughout the meat, ensuring maximum tenderness and flavor in every bite.