In A Large Saucepan, Saute Leeks, Mushrooms, Broccoli And Garlic In Butter Until Tender. Add Flour, Thyme, Pepper And Bay Leaf; Mix Well. Stir In The Broth And Cream. Bring To A Boil; Cook And Stir For 2 Minutes Or Until Thickened. Add The Cheese And Crab; Stir Until Cheese Is Melted And Soup Is Heated Through. Discard Bay Leaf Before Serving.