In a large bowl, combine the ground beef, soy sauce, brown sugar, sesame oil, minced garlic, minced ginger, and black pepper. Mix until well combined.
Heat a large skillet over medium-high heat. Add the seasoned ground beef and cook, breaking it apart with a spatula, until fully browned and cooked through, about 8-10 minutes.
Stir in the chopped green onions and sesame seeds, cooking for an additional 2 minutes.
To serve, place a generous scoop of cooked rice in each bowl. Top with the bulgogi beef mixture, shredded carrots, sliced cucumbers, and kimchi if desired.
Enjoy your bulgogi beef bowls warm!