Instant noodles have two components and they're not equally good. The noodles: thin, wheat-based, pre-cooked and dried, ready in 2-3 minutes. The flavour sachet: highly engineered, aggressively salty, one-dimensional. This guide uses the first and ignores the second.
The sachet is designed to deliver a specific flavour profile in the simplest possible preparation - add boiling water. That's a different product from a stir-fry. In a stir-fry, the noodles are tossed in oil and a sauce over high heat, and the result is dry, slightly charred, and coated. A broth seasoning sachet doesn't work in that context - it's too salty, too thin, and too single-note.
The noodles without the sachet are essentially a fast ramen-style base: neutral wheat noodles that absorb whatever you cook them in. They're not meaningfully different from fresh noodles in a stir-fry context once you've cooked them right.
2 tbsp soy sauce, 1 tsp sesame oil, 1 tsp rice vinegar, 1 tsp sugar, 1 clove garlic grated. Mix before you start cooking. Pour over noodles in the last 60 seconds of the stir-fry and toss.
1 tbsp peanut butter, 1 tbsp soy sauce, 1 tsp sriracha, juice of half a lime, hot water to loosen to a pourable consistency. Add to the noodles off the heat - the peanut butter splits in a very hot pan. Toss thoroughly and serve immediately.
2 tbsp oyster sauce, 1 tbsp water, generous amount of freshly cracked black pepper. This is the simplest sauce on the list - pour over and toss for 30 seconds. The pepper is the dominant flavour; don't be shy with it.
Frozen stir-fry vegetables (using the high-heat dry-pan method from the frozen veg guide) can go into the pan before the noodles. Cook them first until they have some colour, push to the side, add noodles, then bring it all together with the sauce.
Fresh options that work fast: shredded cabbage (2 minutes over high heat), spring onions (30 seconds), spinach (wilts in residual heat off the heat - add last).
Plain noodle stir-fry with egg and soy-garlic sauce: ~420 kcal, 18g protein. With added tuna: ~490 kcal, 40g protein. With frozen edamame and egg: ~510 kcal, 28g protein.
Stir-fried noodles don't keep well - they stick and dry out in the fridge. Make this fresh and eat immediately. If you do have leftovers, add a splash of water and a few drops of soy when reheating in a pan to loosen them. For the full guide to building satisfying meals from convenience ingredients, see the Instant Food, Elevated guide.