Heat 2 TBLSP Olive Oil. Sauté Chicken Breasts In The Oil In A Large Skillet. Skin Side First Until Crispy. Then Turn. Cook On Medium Heat Until Almost Cooked Through. Add 1/2 Butter. Without Removing Oil. Add Mushrooms, Shallots, & Garlic. Sauté Until Mushrooms Are Tender. Add Marsala Wine. Reduce To Half Way. Add Beef Broth. Reduce To Half Way. Salt & Pepper To Taste. Take Remaining Butter, Roll It In Flour & Add To Skillet. Stir Until Sauce Thickens.