Place 3 Tablespoons butter in small glass cup. Microwave at Med Hi 45 seconds til melted. Let stand l minute. Skim foam from surface and discard.
Heat a large nonstick skillet coated with cooking spray over med hi heat, add mushrooms, shallots and garlic. Cook 3 min. or til moisture evaporates; remove mixture from pan and set aside.
Place each chicken breast half between 2 sheets plastic wrap, pound to 1/4 inch thickness. Sprinkle both sides with 1/8 tsp salt and 1/8 tsp pepper. Dredge breast halves in flour.
Add clarified butter to pan and heat on med hi. Add chicken, cook 3 min on each side til lightly browned. Remove chicken from pan. Return mushroom mixture to pan;add broth and Marsala scraping pan to loosen browned bits. Bring mixture to a boil, reduce heat and simmer 5 minutes or reduceds to l cup. Stir in peas, cook 1 min. Add 1 Tblespoon butter, half and half, salt and pepper stirring until butter melts. Return chicken to pan, cook until heated. Serve chicken and sauce over pasta.
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