Prepare the eggs:
Crack the eggs into a bowl, add a pinch of salt, and lightly beat until combined.
Cook the vegetables:
Heat the oil in a pan over medium heat. Add the onion and garlic, sautéing until fragrant. Toss in the mixed vegetables and stir-fry for about 3–4 minutes until slightly tender but still colorful.
Add the eggs:
Push the vegetables to one side of the pan. Pour in the eggs and let them set slightly before gently scrambling.
Combine and season:
Mix everything together, then add soy sauce, black pepper, and optional chili flakes or sesame oil. Stir well and cook for another 1–2 minutes.
Serve and enjoy:
Remove from heat and serve warm on its own or over rice or noodles.