Prepare the sauce by combining soy sauce, sweet chili sauce, brown sugar, sesame oil, cornflour, garlic, and ginger in a bowl. Whisk until smooth and set aside.
Heat oil in a large nonstick pan or wok over medium-high heat. Add beef strips and cook for about 2 minutes on each side until browned but still tender. Remove beef from the pan and set aside.
Add broccoli, green beans, and red capsicum to the pan. Add a splash of water and stir fry for about 3 minutes until vegetables are bright and slightly tender.
Return beef to the pan and add cooked egg noodles. Pour the prepared sauce over everything and stir to coat all ingredients. Cook for another 2 minutes.
Sprinkle sesame seeds on top before serving. Serve hot.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently with a splash of water or broth.