Vegan Chik'n Teriyaki with Oyster Mushrooms and Brussels Sprouts

Ingredients

• 1 pound Brussels sprouts
• 3-4 cups oyster mushrooms
• 2 tbsp reduced sodium tamari (or soy sauce if not g/f) (or liquid aminos if soy-free)
• 4 green onions, sliced, optional
• 1 tsp sesame seeds, optional
• 1 tsp red pepper flakes, optional
• 1 cup Teriyaki Sauce
• 1/4 cup reduced sodium tamari (or soy sauce if not g/f) (or liquid aminos if soy-free)
• 1/4 tsp ground ginger (or more, to taste)
• 3 tbsp coconut sugar (or sub brown sugar)
• 1 tbsp maple syrup
• 1 cup water
• 2 tbsp corn starch + 1/4 cup water