Creating Slow Cooker Mongolian Chicken is straightforward if you follow these simple steps:

1. Prepare the Chicken: Trim any excess fat from the chicken thighs and place them in the slow cooker.
2. Mix the Sauce: In a medium bowl, whisk together the soy sauce, brown sugar, hoisin sauce, minced garlic, and grated ginger until well combined.
3. Pour the Sauce: Pour the sauce mixture over the chicken in the slow cooker, ensuring the chicken is well-coated.
4. Cook: Cover the slow cooker and cook on low for 6 hours or on high for 3 hours.
5. Thicken the Sauce: In the last 30 minutes of cooking, mix cornstarch with cold water in a small bowl until smooth. Stir this mixture into the slow cooker to thicken the sauce.
6. Finish Cooking: Cover and continue cooking for an additional 30 minutes, allowing the sauce to thicken.
7. Garnish: Once cooked, serve the Mongolian chicken hot, garnished with sliced green onions.
8. Serve: Pair with cooked rice or noodles to soak up the delicious sauce.

These steps will guide you in creating this incredible dish effortlessly.