Teriyaki Pineapple Chicken Foil Packets is a delicious, colorful, and easy meal that combines juicy chicken, sweet pineapple, crisp vegetables, and a rich homemade teriyaki sauce, all cooked together in convenient foil packets that lock in moisture and flavor. To make this recipe, start by gathering 4 boneless skinless chicken breasts or 6 boneless skinless chicken thighs, 2 cups fresh pineapple chunks, 1 red bell pepper sliced into strips, 1 yellow bell pepper sliced into strips, 1 medium red onion sliced, 1 zucchini sliced into half-moons, 2 tablespoons olive oil, 2 tablespoons sesame seeds, 2 green onions finely sliced, and a little cooking spray. For the homemade teriyaki sauce, combine ½ cup low-sodium soy sauce, ¼ cup honey, 2 tablespoons brown sugar, 2 tablespoons rice vinegar, 1 tablespoon sesame oil, 3 cloves garlic minced, 1 tablespoon freshly grated ginger, and 1 tablespoon cornstarch mixed with 2 tablespoons water. In a small saucepan, add the soy sauce, honey, brown sugar, rice vinegar, sesame oil, garlic, and ginger. Place over medium heat and stir until everything is well blended. Add the cornstarch slurry and continue stirring until the sauce thickens slightly. Remove from heat and allow it to cool for a few minutes. Pat the chicken dry with paper towels and place it in a large bowl. Pour half of the teriyaki sauce over the chicken and toss well to coat. Cover and marinate for at least 30 minutes, although 2 to 4 hours will provide even deeper flavor. While the chicken marinates, prepare the vegetables and pineapple. Cut four large sheets of heavy-duty aluminum foil, each large enough to fully enclose a serving. Lightly spray the center of each sheet with cooking spray. Divide the sliced bell peppers, onion, zucchini, and pineapple chunks evenly among the foil sheets, creating a bed for the chicken. Drizzle the vegetables lightly with olive oil and season with a small pinch of salt and black pepper. Place a marinated chicken breast or thigh on top of each vegetable pile. Spoon some additional teriyaki sauce over each piece of chicken and scatter a few pineapple chunks over the top. Fold the long sides of the foil together and seal tightly, then fold the ends upward to create secure packets that will keep all juices inside during cooking. Preheat the oven to 400°F (200°C). Arrange the foil packets on a large baking sheet and bake for 25 to 35 minutes, depending on the thickness of the chicken, until the internal temperature reaches 165°F (74°C). If using a grill, preheat it to medium-high heat and cook the packets for approximately 20 to 25 minutes, turning once halfway through cooking. Carefully open one packet to check for doneness, being cautious of the hot steam. For a lightly caramelized finish, open the foil packets during the final 5 minutes of cooking and return them to the oven or grill. This allows the teriyaki sauce to thicken and glaze the chicken beautifully. Once cooked, remove the packets from the heat and let them rest for 5 minutes. Sprinkle generously with sesame seeds and sliced green onions. The sweet pineapple juice combines with the savory teriyaki sauce to create a flavorful broth at the bottom of each packet, making every bite incredibly juicy and satisfying. Serve directly in the foil packets for easy cleanup or transfer everything onto plates. These Teriyaki Pineapple Chicken Foil Packets pair wonderfully with steamed jasmine rice, brown rice, coconut rice, quinoa, or even cauliflower rice for a lighter option. The combination of tender chicken, vibrant vegetables, and sweet pineapple creates a balanced meal packed with protein, vitamins, minerals, and natural sweetness. Pineapple provides vitamin C and digestive enzymes, while the vegetables contribute fiber and antioxidants. The sealed foil packet method keeps the chicken moist without requiring excessive oil, making this meal both flavorful and wholesome. For extra variety, you can add broccoli florets, snap peas, mushrooms, carrots, or baby corn. Some cooks also enjoy adding a pinch of red pepper flakes for a gentle spicy kick that contrasts beautifully with the sweetness of the pineapple and honey. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days and reheated gently in the microwave or oven. This recipe is ideal for busy weeknights, family dinners, meal preparation, summer cookouts, and outdoor gatherings because it requires minimal cleanup while delivering restaurant-quality flavor. The rich teriyaki glaze, juicy chicken, sweet tropical pineapple, and colorful vegetables come together in every packet to create a satisfying meal that is comforting, fresh, and packed with irresistible sweet-and-savory flavor.