In a large bowl, whisk together 1 tablespoon of the soy sauce, brown sugar, chili sauce, and vinegar. Let sit for 10 minutes.
As dressing rests, place frying pan over medium heat. Add in oil and sauté mushrooms, 5-6 minutes. Finish with remainder of the soy sauce and garlic 1-2 minutes before mushrooms are done, 8 minutes in total
Once dressing has rested and mushrooms cooked, toss the veggies and shrimp in the dressing bowl to combine. Serve immediately topped with the sesame seeds and a dash of sriracha, and with or without rice!