Cut the chicken thighs into bite-sized pieces and coat them with a mixture of cornstarch, salt, and black pepper.
Mix together the orange juice, honey, soy sauce, rice vinegar, minced garlic, minced ginger, sesame oil, and red pepper flakes in a separate bowl.
Heat vegetable oil in a skillet over medium-high heat and cook the chicken until golden brown, about 5-7 minutes.
Reduce heat, add the orange sauce to the skillet, and return the cooked chicken. Toss to coat and cook for an additional 2-3 minutes until the sauce thickens.