Preheat your oven to 350°F (175°C).
Prepare the cake batter according to the package instructions.
Pour the batter into a greased round cake pan.
Bake for 25 minutes or until a toothpick comes out clean.
Let the cake cool completely.
In a bowl, whip the heavy cream until soft peaks form.
Add powdered sugar and vanilla extract, then mix until well combined.
Slice the cooled cake horizontally into two layers.
Spread a layer of whipped cream on the bottom layer, followed by sliced strawberries.
Place the top layer of cake, then cover with whipped cream and cereal for crunch.