Add the sauce ingredients to a bowl and mix to combine. Add chicken (or tofu) and toss to combine. Add parchment paper on top and place in the fridge for up to 2 hours before cooking.
Add chicken and sauce to a skillet over medium heat, and cook for 3-5 minutes on one side, flip over and cook for an additional 3-5 minutes. Keep an eye on the chicken to see if it needs only 3 minutes on each side or longer, depending on the meat's thickness, to ensure it cooks evenly.
Remove cooked chicken from the skillet and set aside. Using the same skillet, add 1 teaspoon of toasted sesame seed oil and add the veggies you prefer: broccoli, carrots, celery, cabbage, mushrooms, brussels sprouts. Saute for about 5-7 minutes until all the veggies start to wilt and soften. Add chicken back to the pan and toss to combine.
Prepare vermicelli by following the instructions on the back of the label. Once cooked, add noodles to the chicken and veggies. Toss to combine.
Divide food into serving bowls or plates, top with cilantro, green onions, and black sesame seeds to serve.