Melt 2 tablespoons butter in large skillet and saute mushrooms until just cooked. Remove mushrooms with slotted spoon and set aside.
In same pan, melt 2 tablespoons of butter and add flour to make a roux. Stir for 1-2 minutes. Add cream and stir to combine. Add salt and pepper, sherry and just enough paprika to give a bit of pinkness to the sauce. Stir until heated through.
Return mushrooms and any juice that has collected to the cream sauce. Pour into greased baking dish.
Mix breadcrumbs with the melted butter and spread over the mushrooms.