Start by pressing the firm or extra-firm tofu using paper towels to remove any excess moisture; this is key for achieving a crispy texture. Tear the tofu into bite-sized chunks, then season lightly with salt and pepper. Set the tofu aside while you prep the other ingredients.

Bring a pot of water to a boil, then add your chosen noodles (mie, ramen, udon, or rice noodles) and cook according to the package instructions, ensuring you slightly undercook them for a perfect texture. Once done, drain the noodles and set them aside, allowing them to steam off while the other components are prepared.

In a large skillet, heat 1 tablespoon of neutral oil over medium-high heat. Once hot, add the seasoned tofu pieces in a single layer, frying them for 8 to 10 minutes until they develop a golden-brown crust. Drizzle in 3 tablespoons of hoisin sauce, tossing to coat the tofu in the rich flavor, then remove the tofu from the skillet and set aside.

In the same skillet, add the remaining tablespoon of neutral oil and heat it over medium-high. Add the sliced onion, red bell pepper, and julienned carrot, stir-frying them for about 4 to 5 minutes until the vegetables are tender but still crisp and vibrant in color. This step adds essential flavor that complements the Hoisin Tofu Stir-Fry Noodles beautifully.

Next, incorporate the minced garlic and sliced pak choi into the skillet, stirring continuously until the pak choi wilts, which should take about 2 minutes. Season the mixture with a pinch of salt and pepper to enhance the natural flavors. The aroma will fill your kitchen, signaling that the dish is coming together perfectly.

Return the crispy tofu to the skillet along with the cooked noodles. Drizzle 2 tablespoons of soy sauce and toss everything together for 2 to 3 minutes over medium heat. Ensure all ingredients are well combined and coated in the delicious sauce, allowing the noodles to warm through.

Once fully heated, plate the Hoisin Tofu Stir-Fry Noodles hot. Garnish with extra sliced spring onions and, if desired, a sprinkle of sesame seeds. For an extra kick, you can drizzle some lime juice or chili oil on top. Enjoy your vibrant, healthy meal that's ready to impress!