Remove stems from mushrooms ands place in food processorwith carrot, onion, and clams. Once finely chopped, place in saucepan with garlic and about 1/4 - 1/2 cup butter. Saute until tender. Mix cheeses together, leave 3/4 cup set aside. Mix stem mixture, bread crumbs, egg, and cheese together. Mixture should pack well and not be wet or crumbly - add to mixture as you see fit. Stuff mushrooms and place in 13 X 9 baking dish. Sprinkle remaining cheese on top, cut butter into pats over top of cheese. Bake at 350 until mushrooms are fully cooked. Broil about 5 minutes to brown the tops. Remove from oven and serve immediately.
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