Step 1: Prepare the Noodles and Sauce
Cook the rice noodles according to package instructions until tender. In a mixing bowl, whisk together brown sugar, soy sauce, rice vinegar, lime juice, and fish sauce to create a balanced savory-sweet sauce. Set it aside for when you combine everything later.
Step 2: Cook the Protein
In a wok or a large sauté pan over medium-high heat, warm the vegetable oil. Add chicken pieces and cook them until no longer pink, about 6 minutes. If using shrimp, sauté for about 1 1/2 minutes on each side until they turn opaque. Transfer the cooked protein to a plate, but keep the flavorful oil in the pan for the vegetables.
Step 3: Sauté the Vegetables
Add the red bell pepper and carrots to the same pan, sautéing for 1 to 2 minutes to retain some crispness. Incorporate the garlic, green onions, and bean sprouts, cooking for another minute until they are just tender and fragrant.
Step 4: Cook the Eggs and Combine
Push the sautéed vegetables aside, crack the eggs into the center of the pan, and scramble them until fully set. Add the earlier-cooked protein, the ready noodles, and your pre-mixed sauce. Toss everything together, ensuring thorough coating, and cook for 1 to 2 minutes to meld the flavors.
Step 5: Garnish and Serve
Serve the Pad Thai hot, garnished with chopped cilantro, peanuts for texture, and optional red pepper flakes and sesame seeds for a spice and flavor boost.