Add the sliced red bell pepper and julienned carrot. Stir-fry for about 3-4 minutes until the vegetables are slightly tender but still crisp.
Combine and Season:
Add the blanched broccoli to the pan and toss to combine.
In a small bowl, mix the soy sauce (or tamari), hoisin sauce (if using), rice vinegar (or lime juice), maple syrup, and red pepper flakes. Pour this sauce over the vegetables.
Add the cooked noodles to the pan, tossing everything together until the noodles are well-coated with the sauce and the vegetables are evenly distributed.
Serve:
Divide the noodles and vegetables among serving bowls.
Garnish with sliced green onions, sesame seeds, and fresh cilantro or basil.