In a medium mixing bowl, combine the brown sugar, soy sauce, apple cider vinegar, minced garlic, and grated ginger. Stir until the brown sugar is completely dissolved. Place the chicken thighs in the marinade, ensuring they're fully coated. Cover and refrigerate for a minimum of 30 minutes.
Heat a large skillet over medium heat. Remove the chicken from the marinade and place it in the skillet. Sear for approximately 5-7 minutes on each side until golden brown and cooked through. Transfer the cooked chicken to a plate.
In the same skillet, pour in the reserved marinade and bring to a simmer. Allow it to bubble gently for about 3-4 minutes. Mix the cornstarch with 2 tablespoons of water to create a slurry and stir it into the simmering sauce until it thickens.
Gently fold in the diced pineapple into the sauce and simmer for an additional 2-3 minutes until warmed through.
Return the cooked chicken to the skillet, ensuring it's evenly coated with the sauce and pineapple. Cook for an additional minute.
Divide the chicken among serving plates, spooning the sauce and pineapple over each portion. Garnish with sliced green onions and sesame seeds.
Notes
For an enticing presentation, serve the chicken over a fluffy bed of steamed jasmine rice or quinoa.
Keyword brown sugar, chicken, easy recipe, pineapple