Cook the rice noodles according to package instructions. Drain and set aside.
In a large skillet or wok, heat the vegetable oil over medium-high heat. Add the minced garlic and sliced onion, sautéing for about 1 minute until fragrant.
Add the bell pepper, broccoli, and snap peas to the skillet. Stir-fry for about 3-4 minutes until the vegetables are tender-crisp.
Push the vegetables to one side of the skillet and pour the beaten eggs into the other side. Scramble the eggs until fully cooked, then mix with the vegetables.
Add the cooked rice noodles to the skillet. Pour in the soy sauce, oyster sauce, fish sauce, sugar, and chili flakes. Toss everything together until well combined and heated through, about 2-3 minutes.
Remove from heat and stir in fresh basil leaves. Serve immediately with lime wedges on the side.