Step 1
In a large mixing bowl, cream together the sugar and shortening until light and fluffy. Add the egg and vanilla extract; beat until fully incorporated.

Step 2
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add the dry mixture to the creamed ingredients, alternating with the milk. Mix just until combined.

Step 3
Spread the batter evenly into a greased 9-inch square baking pan. Bake at 350°F (175°C) for 20–25 minutes, or until a toothpick inserted in the center comes out clean. Cool the cake completely on a wire rack.

Step 4
While the cake cools, slice the strawberries. If desired, toss them with a bit of extra sugar to bring out their juices.

Step 5
Cut the cake into 9 squares. Slice each piece in half horizontally to create top and bottom layers. Spoon strawberries and a generous dollop of whipped cream onto the bottom half. Place the top half back on and add more whipped cream and berries on top.

Step 6
Serve immediately for the freshest flavor and best texture.