After slicing the chicken breasts in half lengthwise, remove any excess fat that is still there.
Salt, pepper, and garlic powder are the seasonings that should be applied to the chicken. Sprinkle flour over each individual piece.
In a skillet, bring the olive oil and 1 tablespoon of the butter to a warm temperature over medium-high heat. As soon as the pan is heated enough, add the chicken and sear it for 4-5 minutes on each side, or until it is brown.
Remove the chicken from the skillet and put it aside; the cooking process will be completed in the sauce.
In the same skillet, add the mushrooms and the rest of the butter. Cook for another three to five minutes, stirring periodically until the mushrooms have browned.
In the skillet, stir in the minced garlic, then add the marsala wine and let it boil for about two to three minutes.
First, place the chicken back into the pan, and then pour the cream into the pan. Continue to cook for a further 4–5 minutes, or until the chicken is fully cooked and the sauce has thickened up a little bit. If necessary, season with additional salt and pepper.
To put the finishing touches on it, I sprinkled some chopped parsley over the top (optional).