Marinate the chicken by whisking together apple cider, soy sauce, honey, Dijon mustard, minced garlic, ground cinnamon, black pepper, and salt. Add chicken thighs and coat well. Cover and refrigerate for at least 30 minutes or up to 2 hours.
Prepare the apple cider glaze by reserving the marinade after marinating the chicken.
Heat olive oil in a skillet over medium-high heat. Cook chicken thighs for about 5-7 minutes on each side until browned and cooked through. Pour reserved marinade into the skillet, bring to a boil, then reduce heat and simmer for 5-10 minutes until thickened.
Prepare the autumn slaw by combining shredded cabbage, shredded carrots, thinly sliced red apple, and chopped green onions in a bowl. In a separate bowl, whisk together mayonnaise, apple cider vinegar, honey, and a pinch of salt and pepper. Pour dressing over slaw and toss to combine.
Serve the sticky apple cider chicken over the autumn slaw.