Heat oil in a large skillet over high heat. Add chicken (I had to do it in two batches) and sear until golden brown on both sides, 2-3 minutes per side.
Transfer the chicken thighs to the slow cooker.
In a medium bowl combine ketchup, soy sauce, honey, lime juice, sriracha and garlic.
Pour the sauce over chicken and toss to combine.
Cover and cook on low for 5-6 hours or on high for 2-3 hours.
Serve with sesame seeds and green onions for garnish, if desired..