Preheat oven to 400F. In a large bowl, add chicken strips, ½ tbsp of olive oil, cornstarch and salt and pepper. Toss until the chicken is coated - SEE NOTE**
Add chicken to one side of the baking sheet. Then, add cauliflower florets and bell pepper to the other side of the baking sheet. Drizzle olive oil over the veggies and season with salt and pepper. Toss until coated. Then, spread out and make sure nothing is overlapping - SEE NOTE***
Transfer to the oven and bake for 25 minutes or until the veggies are fork tender and the chicken reaches an internal temp of at least 165F.
In the last 5 minutes of the sheet pan cooking time, add all sauce ingredients except for the cornstarch to a small pot. Whisk. Bring to medium heat. In a small bowl, mix together the cornstarch and a bit of water to make a slurry. Then, once the sauce mixture is hot and beginning to bubble, slowly pour in the cornstarch slurry while whisking constantly. Reduce the heat to low and let it simmer until the sauce has thickened.
Once the chicken and veggies are done baking, push them together on the baking sheet and pour the sauce all over. Toss to coat everything in the sauce.
If desired, serve over a bed of cooked white rice and top with some chopped green onion, chopped nuts and sesame seeds. Enjoy!