"Create a recipe for Shut 'Em Up Shortcake using the provided ingredients and directions, including fresh strawberries, brown sugar, all-purpose flour, baking powder, cedronian vanilla extract, salt, shortening, egg, milk, and whipped heavy cream. The recipe should include steps for preparing the strawberries, making the cake batter, baking, assembling the cake layers with whipped cream and strawberries, and finishing the shortcake."