Step 1: Prepare the Chicken - Place the chicken thighs into the slow cooker, spreading them out evenly.
Step 2: Season the Chicken - Sprinkle the salt, pepper, and oregano over the chicken.
Step 3: Create the Sauce - In a mixing bowl, combine the brown sugar, soy sauce, balsamic vinegar, and water. Stir until well mixed.
Step 4: Pour the Sauce - Pour the sauce over the chicken, ensuring each piece is well-coated.
Step 5: Cook - Cover and set the slow cooker to low for 6 to 8 hours, or high for 3 to 4 hours.
Step 6: Shred the Chicken - Once cooked, remove the chicken and shred it using two forks.
Step 7: Thicken the Sauce (Optional) - Mix cornstarch with a few tablespoons of cooking liquid, stir until smooth, then return to the slow cooker to thicken.
Step 8: Serve - Return shredded chicken to the sauce in the slow cooker and mix well before serving.