Start rice if using, cook according to the package.
Prepare veggies. Slice the bell peppers into thin strips, remove the seeds and white fleshy part. Slice the red onion and mushrooms and chop the broccoli. Use the broccoli stems! This has a ton of nutritional value and doesn't need to be wasted.
Make the teriyaki sauce. In a bowl, whisk soy, sugar, seasoning, honey, sriracha, water, minced garlic and sesame seeds. (Do not add the cornstarch slurry until later when the sauce is cooking in the skillet) Set this aside.
Cook veggies. In a large skillet heat oil on medium high heat. Add the peppers, onions, broccoli to the pan. Let it simmer on medium/high untouched for about 4 minutes. Then give it a good toss and add in the mushrooms. Let the veggies steam for and char for another 3-4 minutes. Set the veggies on a plate or in a bowl to the side. Wipe the pan with a damp paper towel.
Cook shrimp. Add 1 tsp oil to the pan, add the thawed shrimp. Sprinkle with a pinch of salt and pepper (about ¼ tsp). Let the shrimp cook for about 3-4 minutes on each side or until it's light pink throughout. Set the shrimp aside in the bowl with the veggies. Wipe the skillet once more.
Add the teriyaki sauce to the skillet and simmer the sauce on low for about 4 minutes. In a small bowl or jar, mix the cornstarch slurry together (the cornstarch and water), add it to the simmering teriyaki sauce. This will thicken the sauce.
Let the sauce simmer for another 2-3 minutes. Add the veggies and shrimp. Toss together and cook for another 1-2 minutes or until everything is heated throughout. Serve immediately over rice or noodles and enjoy!