Coat the Chicken: In a bowl, toss the chicken pieces with cornstarch, salt, and pepper until well-coated.
Sear the Chicken: Heat 1 tablespoon of olive oil in a skillet over medium heat. Lightly brown the chicken (about 2-3 minutes per side).
Prepare the Sauce: In a bowl, whisk together orange marmalade, soy sauce, rice wine vinegar, sesame oil, ground ginger, and garlic powder.
Slow Cook: Add the browned chicken to the crockpot. Pour the sauce over it, stirring gently to coat.
Set the Timer: Cook on low for 3-4 hours or high for 1.5-2 hours until the chicken is tender and coated in a thick sauce.
Final Touches: Stir in toasted sesame seeds and garnish with green onions and optional orange slices.
Serve & Enjoy: Pair with Keto Cabbage Rice or Cucumber Salad for a balanced meal.