In a large skillet, heat the vegetable oil over medium-high heat.
Add the ground beef and cook until browned, breaking it apart with a spatula, about 5-7 minutes. Drain excess fat if necessary.
Add the minced garlic and cook for an additional minute until fragrant.
Stir in the soy sauce, brown sugar, sesame oil, ground ginger, and red pepper flakes (if using).
Cook for another 2-3 minutes, allowing the sauce to thicken slightly.
To serve, place a scoop of cooked rice in a bowl, top with the Korean beef mixture, and garnish with shredded carrots, chopped green onions, and sesame seeds.