Add shallots, garlic and mushrooms to pan; saute 3 minutes or until moisture evaporates. Add remaining 2 tbsp. of flour and thyme to pan, and cook for 1 minute, stirring well. Combine chicken broth and Marsala, stirring until smooth. Gradually add broth mixture to pan, stirring constantly with a whisk, bring to a boil. Reduce heat and simmer 2 minutes or until sauce thickens.
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