Wash bok choy and mushrooms thoroughly. Chop about 1/2" off the base of the bok choys and then slice in half vertically. Chop mushrooms into 1/2" slices.
In a large skillet, toast sesame seeds on medium heat for 2 minutes.
Mix maple syrup, sriracha, tamari, and white pepper together in a small bowl.
Add 1 Tablespoon of oil to the pan and heat to medium.
Add green onions and sauté 4-5 minutes.
Add bok choy, chopped side down directly on the pan and sauté for 4-5 more minutes.
Add mushrooms and cover for 3 minutes.
Turn heat to high and add sauce and vegetable broth.
Cook on high, stirring frequently until the sauce thickens and bok choy is tender.