Heat vegetable oil in a large skillet or wok over medium heat.
Add diced onion and sauté until translucent.
Stir in minced garlic and cook for about 30 seconds.
Add mixed vegetables and cook until tender.
Push the vegetables to one side of the pan.
Pour the beaten eggs into the empty side and scramble until fully cooked.
Combine the scrambled eggs with the vegetables.
Add the cooked rice to the skillet, breaking up any clumps.
Drizzle soy sauce and sesame oil over the rice and mix thoroughly.
Season with salt and pepper, and garnish with chopped green onions.