1. In a large bowl, mix together the brown sugar, soy sauce, minced garlic, sriracha, ground ginger, salt, and pepper. Add the chicken thighs and toss to coat well. Let marinate for at least 30 minutes, or overnight in the refrigerator for deeper flavor.
2. Heat the olive oil in a large skillet over medium-high heat. Add the marinated chicken, cooking each side for about 5-6 minutes, or until browned and cooked through.
3. Remove the chicken from the skillet and set aside. In the same skillet, add the pineapple chunks and lime juice, stirring to scrape up any browned bits from the bottom of the pan.
4. Return the chicken to the skillet, mixing it with the pineapple and cooking for another 2-3 minutes, allowing the flavors to meld together.
5. Once done, garnish with fresh cilantro if desired and serve hot.

Remember, cooking is all about following your senses. If the aroma is inviting and the chicken is caramelized to your liking, you know you’ve nailed it!