Heat 1 tbsp oil in a large skillet over medium-high heat; brown the minced chicken until no pink remains. Season lightly with salt and pepper.
Push chicken to the side, add remaining oil, sauté onion and garlic until soft. Stir in frozen veggies and cook 2–3 minutes.
Move mixture to the side, pour in beaten eggs and scramble until just set. Combine everything.
Add rice, soy sauce, and sesame oil; toss and fry until heated through and slightly crispy in spots. Stir in green onions and adjust seasoning.