Mix ⅓ cup soy sauce,, 3 tablespoons brown sugar, 4 tablespoons rice vinegar, 1 teaspoon sriracha,, ½ teaspoon sesame oil, ½ cup chicken broth or vegetable broth,, and 1 tablespoon cornstarch. Whisk until cornstarch is dissolved and set aside.
Add 1 ½ pounds shrimp,, 2 cups broccoli florets, 1 sliced red bell pepper , ½ cup sliced mushrooms,, and 2 teaspoons minced garlic to a large greased pan and cook over medium heat for 3-5 minutes until shrimp is cooked through (fully pink), mushrooms are tender, and garlic is fragrant.
Add sauce mixture and bring to a boil, reduce to a simmer and cook for 5-10 minutes.
Sprinkle ½ teaspoon crushed red pepper flakes, 2 chopped green onions, and 1 cup crispy wonton strips on top and serve immediately. Serve with steamed white or brown rice.