Steam lobsters in 1 inch boiling salted water in large kettle or Dutch oven 8 to 10 minutes. Remove from pot, reserving 1/4 cup liquid; cool.
Remove meat from lobster shell, tail and claws; and coarsely chop. Set aside.
Preheat oven to 400°F. Meanwhile, sauté mushrooms and onions in butter in large skillet until tender. Add flour, stirring until smooth. Cook 1 minute, stirring constantly. Gradually add half-and-half; cook over medium heat, stirring constantly, until mixture is thickened and bubbly. Stir in mustard, salt, red pepper flakes and reserved lobster meat.
Spoon into six (6-oz.) well-greased ovenproof baking dishes or shells; sprinkle each with Parmesan cheese and paprika. Bake 10 minutes or until lightly browned.
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