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Export 13 ingredients for grocery delivery
Line a 3 to 6-quart slow cooker with a liner if using one. I prefer to use liners for easy cleanup.
Drizzle 1 tablespoon olive oil over bottom of the liner or slow cooker.
To a large, gallon-sized ziptop plastic bag, add the chicken, cornstarch, salt, pepper, seal bag, and toss to coat chicken evenly. Add chicken to slow cooker, evenly distributed; set aside.
To a 2-cup measuring cup or medium bowl, add the orange marmalade, soy sauce, rice wine vinegar, sesame oil, ginger (I prefer 1 teaspoon but some people are sensitive to ginger), garlic, remaining 1 tablespoon olive oil and stir to combine.
Pour mixture over the chicken, using a spoon to distribute the sauce as necessary, making sure all pieces are coated.
Cook covered on high for about 2 hours or on low for about 4 hours. If cooking on high, start checking at 90 minutes and if cooking on low, start checking at 3 hours. All slow cookers vary so cook until chicken is done (reaches 165F on an instant read thermometer).
Add chicken to a plate with as much extra cooking sauce spooned over the top as desired, garnish with sesame seeds, green onions, optional orange wedges, and serve immediately.