Prepare the Marinade: In a large mixing bowl, combine 1 cup pineapple juice, 1/2 cup soy sauce, 1/4 cup brown sugar, 4 cloves garlic (minced), 1 tbsp grated ginger, 1/4 cup ketchup, and 1 tbsp Sriracha (if using). Whisk together until well blended.
Marinate the Chicken: Add 3 lbs chicken thighs to the marinade, ensuring they are well-coated. Cover the bowl with plastic wrap and refrigerate for at least 1 hour (or overnight for deeper flavor).
Preheat the Oven: Preheat your oven to 400°F (200°C). This temperature helps achieve extra crispiness.
Prepare the Baking Sheet: Line a baking sheet with aluminum foil for easy clean-up and place a wire rack on top for even cooking.
Arrange the Chicken: Take the marinated chicken out of the fridge and place it on the wire rack, skin-side up. Brush the chicken with some of the leftover marinade to enhance the flavor.
Bake the Chicken: Bake in the preheated oven for 35–40 minutes, basting halfway through with more marinade. The chicken should be golden brown and cooked through (internal temperature should reach 165°F (75°C)).
Rest and Serve: Take the chicken out of the oven and let it rest for 5 minutes to allow the juices to redistribute. Serve with additional sauce if desired.