Combine the chicken, soy sauce, dark soy sauce, honey, mirin, ginger paste, and garlic paste in a slow cooker.
Cook on high for 4-5 hours or low for 5+ hours.
In a small bowl, mix the cornstarch and cold water to make a slurry. Add this to the slow cooker after the chicken is done and let it sit uncovered for 15-20 minutes to thicken the sauce.
Cook the rice according to package instructions.
Make the low-cal yum yum sauce by mixing the mayo, greek yogurt, sriracha, and seasonings. Adjust the consistency with milk as needed.
Serve the chicken and rice with the yum yum sauce and chopped green onions.
