Make bechamel: Melt butter, stir in flour and slowly add 1 1/2 cups milk. Cook over low heat until thickened. Fold in fine shreds of prosciutto and goats's cheese. Season with salt and pepper. Cool to room temperature. Preheat oven to 400 degrees. Butter a souffle dish (5 or 6 cup measure). Fold egg yolks into bechamel and fold in cooked pasta. Whip egg whites until stiff but not dry and fold into noodles. Turn into souffle dish and bake for 40 minutes.