Making Adobo Chicken in a slow cooker is straightforward when you follow these simple steps:

1. Prepare Chicken: Rinse the chicken pieces under cold water and pat them dry with paper towels.
2. Combine Marinade: In a mixing bowl, combine the soy sauce, vinegar, onion, garlic, bay leaves, black peppercorns, brown sugar, and water. Mix well.
3. Layer in Cooker: Place the chicken pieces in the slow cooker, and pour the marinade mixture over the top.
4. Set Cooking Time: Cover the slow cooker with its lid. Set it to cook on low for 4-6 hours or on high for 2-3 hours.
5. Check Doneness: The chicken is done when it reaches an internal temperature of 165°F (75°C) and is fork-tender.
6. Taste and Adjust: Before serving, taste the sauce and add salt or more brown sugar if needed to balance the flavors.
7. Remove Chicken: Carefully take the chicken pieces out of the slow cooker and set them on a serving platter.
8. Thicken Sauce (Optional): If you want a thicker sauce, transfer the sauce to a saucepan and simmer on medium heat until it reduces to your desired consistency.
9. Serve: Pour the sauce over the chicken on the platter.

These straightforward steps will guide you in creating an amazing Adobo Chicken meal effortlessly.