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["To prepare pastry, in bowl combine flour, baking powder, and salt.", "Cut in butter using a pastry whisk until mixture resembles coarse crumbles.", "Cut in cheese to form coarse crumbs.", "Stir in milk to form dough.", "Turn onto lightly floured surface, knead for 1-2 minutes, incorporating 1-2 tablespoons of flour, if needed, to make a stiff, smooth dough.", "Roll out to form a 12-inch square.", "Grease a large baking sheet.", "Preheat oven to 400F.", "To prepare filling, in a 2 quart saucepan, melt butter over medium heat.", "Add onion and celery.", "Cook, stirring often, about 5 minutes.", "Add mushrooms.", "Cook stirring often about 5 minutes, until mushrooms are soft.", "Add flour.", "Cook stirring for 1 minute.", "Stir in milk and seasonings.", "Cook 3-5 more minutes until thickened.", "Remove from heat.", "stir in cheese and tuna; cool 5 minutes.", "Spread tuna mixture over surface of dough leaving a 1/2"" border on all sides.", "Roll up jellyroll fashion.", "With a serrated knife, cut into 12 slices.", "Place slices on baking sheet.", "Bake 20-25 minutes or until lightly browned.", "Let stand 4 minutes.", "Brush on beaten egg.", "Bake 5 minutes longer."]
