Heat the olive oil in a large skillet or pot with a tight-fitting lid over medium-high heat. Add the ground beef and cook, breaking it apart with a spoon, until browned. Drain off any excess fat.

Add the minced garlic to the skillet and cook for about 1 minute until fragrant.

Stir in the uncooked rice, beef broth, soy sauce, onion powder, and black pepper. Bring the mixture to a boil.

Once boiling, reduce the heat to low, cover the skillet with the lid, and let it simmer for 15-20 minutes, or until the rice is tender and has absorbed all the liquid.

Remove the skillet from the heat and let it stand, still covered, for 5-10 minutes.

Remove the lid and gently fluff the rice with a fork. Stir in the unsalted butter until it's melted and fully incorporated.

Garnish with sliced green onions and sesame seeds before serving.