Gather all your ingredients. Dice the yellow onion and mince the garlic. If using fresh vegetables, chop them into small, even pieces.
In a large skillet or wok, melt the butter over medium heat until bubbly.
Add the diced onion and sauté for 3-4 minutes until translucent. Stir in the minced garlic and cook for another minute.
Increase the heat to medium-high and add the prepared white rice. Break up any clumps and add the frozen mixed vegetables.
Drizzle the sesame oil, soy sauce, and ground black pepper over the rice mixture. Stir well.
Push the rice mixture to one side and scramble the eggs in the empty space. Once cooked, mix into the rice.
Taste and adjust seasoning if necessary. Serve hot, garnished with green onions or sesame seeds if desired.
