Creating your own Sheet Pan Korean Popcorn Chicken is a simple process if you follow these steps:

1. Preheat Oven: Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper for easy cleanup.
2. Prepare Chicken: In a large bowl, combine the chicken pieces with cornstarch, salt, pepper, garlic powder, and onion powder. Toss until the chicken is evenly coated.
3. Add Oil: Drizzle the vegetable oil over the coated chicken and toss again to ensure even distribution.
4. Spread on Sheet Pan: Arrange the chicken pieces in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
5. Bake: Place the baking sheet in the preheated oven and bake for 20 minutes, or until the chicken is golden brown and fully cooked.
6. Prepare the Sauce: While the chicken is baking, whisk together gochujang, honey, soy sauce, and sesame oil in a medium bowl to create the glaze.
7. Sauce the Chicken: After 20 minutes, remove the chicken from the oven. Pour the sauce over the chicken on the sheet pan and toss to coat evenly.
8. Return to Oven: Return the sheet pan to the oven and bake for an additional 5-10 minutes, until the sauce is bubbly and caramelized.
9. Garnish: Remove the pan from the oven. Garnish with chopped green onions and sesame seeds before serving.
10. Serve: Allow to cool slightly, then serve hot. Enjoy your mouthwatering Sheet Pan Korean Popcorn Chicken!