Step 1: Prepare the Chow Mein Noodles

1. Boil Water: Fill a large pot with water and bring it to a rolling boil.
2. Cook Noodles: Add the chow mein noodles to the boiling water. Follow the package instructions for cooking time, but generally, fresh noodles cook very quickly, often in just 2-3 minutes, while dried noodles may take 5-7 minutes. You want them cooked through but still slightly firm to the bite (al dente), as they will continue to cook in the stir-fry.
3. Drain and Rinse (Optional for fresh noodles, Recommended for dried): Once cooked, immediately drain the noodles in a colander. If using dried noodles, rinse them briefly with cold water to stop the cooking process and prevent them from sticking together. Rinsing fresh noodles is generally not necessary and can make them less flavorful.
4. Toss with Sesame Oil: Transfer the drained noodles to a bowl and toss them with 1 tablespoon of sesame oil. This prevents sticking and adds flavor. Set aside.

Step 2: Prepare the Chow Mein Sauce

1. Combine Sauce Ingredients: In a small bowl, whisk together the soy sauce (or tamari), vegetarian oyster sauce (or hoisin sauce), sesame oil, rice vinegar, cornstarch, sugar (or honey/maple syrup), and vegetable broth (or water).
2. Whisk Until Smooth: Whisk thoroughly until the cornstarch is completely dissolved and the sauce is smooth and well combined. Set aside.

Step 3: Stir-Fry the Vegetables

1. Heat Wok or Large Skillet: Heat a wok or a large, wide skillet over medium-high to high heat. The pan should be hot before adding the oil and vegetables to ensure proper stir-frying.
2. Add Vegetable Oil: Once the pan is hot, add 1 tablespoon of vegetable oil and swirl to coat the bottom of the pan.
3. Sauté Aromatics: Add the sliced onion, minced garlic, and minced ginger to the hot oil. Stir-fry for about 1-2 minutes, or until the onions become translucent and fragrant. Be careful not to burn the garlic and ginger; keep stirring and reduce heat if necessary.
4. Add Heartier Vegetables: Add the sliced bell peppers, julienned carrots, and broccoli florets to the wok. Stir-fry for 3-5 minutes, or until the vegetables are slightly tender-crisp. Stir frequently to ensure even cooking.
5. Add Softer Vegetables: Add the sliced mushrooms, snow peas (or snap peas), and baby corn to the wok. Stir-fry for another 2-3 minutes, or until these vegetables are tender-crisp and heated through. Avoid overcooking, as you want the vegetables to retain some crunch.
6. Optional: Add other vegetables: If you’re using other vegetables like bok choy or cabbage, add them at this stage, adjusting cooking time based on their density. Leafy greens will cook quickly, while denser vegetables may need a bit longer.

Step 4: Combine Noodles, Vegetables, and Sauce

1. Push Vegetables to the Side: Create a well in the center of the wok or skillet by pushing the stir-fried vegetables to the sides.
2. Add Noodles: Add the cooked chow mein noodles to the center of the wok.
3. Pour in Sauce: Pour the prepared chow mein sauce over the noodles and vegetables.
4. Stir-Fry Everything Together: Using tongs or spatulas, toss and stir-fry everything together, ensuring that the noodles and vegetables are evenly coated with the sauce. Continue to stir-fry for 2-3 minutes, or until the sauce has thickened and glazed the noodles and vegetables. The sauce should become glossy and cling to the ingredients.
5. Taste and Adjust Seasoning: Taste the chow mein and adjust seasoning as needed. You may want to add a little more soy sauce for saltiness, rice vinegar for acidity, or sugar for sweetness, depending on your preference. A pinch of white pepper can also be added at this point if desired.

Step 5: Serve Immediately

1. Plate and Garnish: Divide the vegetarian chow mein among plates or bowls.
2. Garnish (Optional): Garnish with toasted sesame seeds, chopped green onions, and chili flakes (if using).
3. Serve Hot: Serve immediately while hot and enjoy your delicious homemade vegetarian chow mein!

Following these step-by-step instructions will guide you through the process of making a flavorful and satisfying vegetarian chow mein that’s perfect for a weeknight meal or a special occasion. The key is to have everything prepared beforehand and to stir-fry quickly over high heat to maintain the texture and flavor of the vegetables and noodles.