Preheat and Prepare Cake Mix: Preheat your oven according to the cake mix package directions. Prepare the cake batter as instructed on the package.
Bake the Cake: Pour the batter into a 9x13-inch baking pan and bake according to the package instructions, typically for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Cool the Cake: Allow the cake to cool completely to room temperature.
Poke Holes: Using the handle of a thin wooden spoon, poke rows of holes across the cake about an inch apart.
Add Strawberry Filling: Spread the strawberry pie filling over the cake, pressing gently to ensure the filling seeps into the holes.
Top with Whipped Topping: Spread the thawed whipped topping evenly over the cake.
Refrigerate: Chill the cake in the refrigerator for at least one hour.
Garnish with Fresh Strawberries: Just before serving, arrange the sliced strawberries on top of the cake. Slice and enjoy!