Slice 12 oz cremini mushrooms and set aside. Place a piece of plastic wrap above and below 3 large chicken breasts. Using a meat mallet or rolling pin, flatten the chicken breasts so that they are the same thickness.
Slice each chicken breast into 3-4 pieces and place them into a large bowl. Season generously with salt and pepper and toss together. Next, sprinkle some all-purpose flour over top. Toss the chicken with the flour until it’s evenly coated with a thin layer of flour. Repeat with more flour if necessary.
Heat a frying pan with 2 Tbsp olive oil. Once hot, sear the chicken strips on each side for 2-3 minutes until a golden crispy coating forms. Place them on a plate and repeat with the rest of the chicken. NOTE: do not overcrowd the pan while cooking the chicken (it won’t get crispy enough).
Add 1 cup beef broth to the pan and gently simmer. Once hot, use a spatula to scrape up any crunchy bits from the chicken. These add great flavor.
Next add in ½ Tbsp fresh thyme, 2 tsp soy sauce, 1 tsp garlic powder and 1 tsp dijon powder. Mix together and cook 1 minute.
In a small bowl, mix together 3 Tbsp cornstarch with 3 Tbsp cold water. Stir until there are no more lumps. Add the liquid cornstarch to the frying pan and stir slowly for 1 minute.
Next, add in 1 cup heavy cream and bring the sauce to a simmer, stirring slowly during the process until the sauce begins to thicken. About 1-2 minutes.
Stir in 12 oz sliced mushrooms and cook 2-3 minutes until they soften. Next, add the cooked chicken slices and mix into the sauce. Cook another 2 minutes to heat the chicken then serve.