Prep the rice: Use cold, day-old rice for the best texture.
If making it fresh, spread hot cooked rice on a sheet pan and chill it in the fridge for at least 30 minutes to dry slightly.
Season the chicken: Toss diced chicken with a pinch of salt, pepper, and 1 teaspoon soy sauce. This adds flavor without extra calories.
Heat the pan: Use a large nonstick skillet or wok over medium-high heat. Add 1 teaspoon neutral oil.
Cook the chicken: Sear the chicken in an even layer for 3–4 minutes, stirring once or twice, until cooked through.
Remove to a plate.
Scramble the egg whites: Add a quick spritz of oil if needed. Pour in the egg whites and scramble just until set, breaking them into small curds. Remove and set aside with the chicken.
Sauté aromatics: Add another 1 teaspoon oil.
Cook onion for 2 minutes until softened. Stir in garlic, ginger, and the white parts of the green onions for 30–45 seconds until fragrant.
Add vegetables: Toss in the mixed veggies. Stir-fry 2–3 minutes until warmed and slightly tender.
Fry the rice: Add the chilled rice, breaking up clumps with a spatula.
Let it sit for 30–45 seconds at a time to lightly toast, then stir. Do this for 3–4 minutes.
Season: Add 1 tablespoon low-sodium soy sauce and the sesame oil. Taste and add more soy sauce as needed.
Stir in rice vinegar and sriracha if using.
Finish: Return chicken and eggs to the pan. Toss to combine and heat through. Fold in the green parts of the green onions.
Adjust salt and pepper.
Serve: Plate hot. For extra crunch and protein, sprinkle with toasted sesame seeds or chopped roasted edamame (optional).