In a bowl, combine crushed pineapple (with juice), soy sauce, ketchup, brown sugar, minced garlic, grated ginger, and black pepper. Stir well.
Place chicken thighs in a single layer at the bottom of the slow cooker.
Pour the pineapple sauce over the chicken. Add diced bell peppers on top.
Cook on LOW for 6–7 hours or HIGH for 3–4 hours. Do not lift the lid during cooking.
Check internal temperature — it must reach 165°F.
Shred chicken in the pot using two forks.
Mix cornstarch and cold water in a small bowl, stir into the crockpot. Turn to HIGH and cook for an additional 15–20 minutes until the sauce thickens.
Serve over steamed rice and garnish as desired.
Calories: Approximately 290 kcal per serving (based on chicken thighs, without rice)
Nutritional values are estimates and may vary based on specific ingredients used.