Put the soy sauce, brown sugar, garlic, ginger, sriracha, oyster sauce, and rice vinegar in a bowl and whisk until evenly combined.
Cut the chicken thighs into bite size pieces and put them in a gallon size plastic bag. Add a few spoonfuls of the sauce to the chicken, massage the bag until the chicken is evenly coated.
Put the sauce in a covered container in the fridge. Marinate the chicken overnight in the fridge.
When ready to cook, boil the spaghetti according to package directions. Drain and rinse with cold water so it doesn't get mushy.
Put the chicken, cooked spaghetti, sauce that we made earlier, mushrooms, red pepper, onion, and carrots on a large tray and head to the griddle.
Preheat the griddle to medium high heat for several minutes. Add some cooking oil and the chicken and veggies. Cook 7 to 9 minutes, flipping and turning a few times with hibachi spatulas.
Add the cooked spaghetti and the sauce. Cook 4 to 5 more minutes, stirring and turning a few times. Transfer in small batches to the same tray you used to carry everything out using the hibachi spatulas.
Serve garnished with sesame seeds and green onions if desired, also extra sriracha, soy sauce and/or yum yum sauce.