Slice chicken in half and pound thin or use thin sliced chicken breasts.
Combine flour and seasoning in a shallow bowl. Set aside.
Heat 1 tbsp olive oil and 1 tsp butter on medium high in a large sauté pan.
Dredge then chicken in the flour, coating both sides and place in pan.
Cook the chicken until lightly browned, then flip, about 3 minutes per side. Set the cooked chicken on a plate.
Add an additional tsp of butter to pan, then add the mushrooms.
Cook mushrooms until they give off all their liquid, about 15 minutes.
Pour in the Marsala wine and reduce by half, scraping any brown bits off the bottom of the pan.
Add the chicken stock, lower the heat to medium low and bring to a simmer.
Once simmering, add the chicken back to the pan.
Add 2 tbsp of butter, salt, pepper and incorporate.
Let simmer for 8-10 minutes.
Plate and serve immediately. Add rice or pasta.
Enjoy!