In a Ziploc bag, add ground beef, breadcrumbs, green onions, garlic, ginger, gochujang, red chili powder, salt, pepper, oil and egg. Seal and mix until combined. You can do this in a bowl but using a Ziploc bag makes clean up so much faster. One less bowl to wash.
Scoop out small portions of the mixture and roll them into small balls and place them on a tray sprayed with oil.
Heat olive oil in a nonstick pan and pan fry the meatballs in medium heat until fully cooked. Do this in batches and don't over-crowd the pan!
Remove the meatballs and place them on a tray, lined with paper towels.
Prepare the Korean glaze now by adding soy sauce, brown sugar, garlic, ginger, vinegar, sesame oil, gochujang paste, red chili powder, salt and pepper in a non-stick saucepan.
Cook on medium heat and bring to a boil.
Make a cornstarch slurry by mixing together cornstarch and water in a small bowl and add it into the boiling sauce.
Mix everything together for a few minutes until the sauce thickens. Then, reduce heat.
Add meatballs in the saucepan and toss them around until they are fully coated. Do this in batches and do not over-crowd the saucepan!
Garnish with sesame seeds and green onions. Enjoy!