Prepare chow mein noodles according to package directions and set aside.
In a large skillet over medium high heat, warm the avocado oil and add the diced chicken thighs. Cook for 2 minutes per side to sear the chicken then remove from heat. (Note: the chicken will not be fully cooked through and will finish cooking in the slow cooker).
In a small mixing bowl, combine the minced garlic cloves, oyster sauce, soy sauce, chicken broth, honey, ground ginger and black pepper until well combined.
Add the seared chicken pieces, carrots, cabbage and whisked sauce to the bottom of a 6 quart or larger slow cooker.
Cover the slow cooker with the lid and cook on high for 2 hours or low for 4-6 hours, until the vegetables are soft and the chicken is fully cooked, with an internal temperature of 165F.
In a separate small bowl, whisk together the cornstarch and water until smooth. Pour into the slow cooker and cook for another 15-20 minutes on high or until the sauce has thickened.
Add the cooked chow mein noodles into the crockpot and toss to mix.
Garnish with the sliced green onions and serve immediately. Enjoy!