Mix on medium heat until the sauce comes to a simmer and thickens up. Then remove it from heat and set it aside for later.
Now slice the chicken breast into thin slices and season both sides with salt and pepper. Then add 1/4 cup of cornstarch to a plate and dredge the seasoned chicken into the cornstarch.
Heat a nonstick skillet to medium-high heat and add 3 Tbsp of avocado oil to the pan. Once it’s hot, cook the chicken on both sides until fully cooked.
Then let the chicken cool and cut it into small cubes. Set aside for later.
In the same skillet, add 1 1/2 cups broccoli florets, 8 oz sliced baby Bella mushrooms, and 1 chopped red bell pepper. Add more oil if needed. Then stir on medium-high heat until the vegetables are crisp and tender.
Now add the chopped chicken back in along with the sauce. Bring it to a slight simmer while mixing everything together for about 4-5 minutes on medium heat. Serve hot and enjoy.
Notes
Cut the chicken evenly- Keep your slices even and thin so the chicken cooks quickly and thoroughly. This keeps it from uneven cooking, leading to dry parts and underdone parts.
Freeze the chicken- Place the chicken breasts in the freezer for 10 minutes to make them a little stiff. This will make cutting them a little easier since they can be pretty slippery.
Cut the vegetables evenly- Keep them all a uniform size both for looks and for even cooking. This way, when you take a bite, you get a little of everything on your fork.
Let the chicken cool before cutting- Let the chicken rest because this is when the juices are reabsorbed. If you cut it when it's just off the stove, the juices will run out, leaving the chicken dry.