In a large bowl, whisk together brown sugar, soy sauce, minced garlic, grated ginger, lime juice, and olive oil until well combined. Add the chicken, ensuring each piece is thoroughly coated in the marinade. Allow to marinate for at least 30 minutes, or up to 2 hours.

Preheat your grill to medium-high heat (about 375°F) or your oven to 375°F.

For grilling, cook the marinated chicken for 6-8 minutes on each side until internal temperature reaches 165°F. For baking, arrange on a baking sheet and bake for 25-30 minutes until cooked through.

In a small saucepan over medium heat, combine pineapple chunks and any remaining marinade. Simmer for about 5-7 minutes until sauce thickens.

Taste the sauce and adjust flavors as needed. Add lime juice or soy sauce to balance sweetness, or chili flakes for heat.

Drizzle the cooked chicken with the pineapple sauce and garnish with fresh cilantro. Serve with steamed rice, grilled vegetables, or your favorite salad.