Pre.heat the oven to 350F. Now prepare the cake according to the package directions. Grease and then flour the two cake pans, and pour the batter into the pans. You should bake the cakes until a toothpick that you insert into the center of the cake comes out clean, about 20 to 25 minutes. Let the cake cool completely on the wire racks.

You should reserve about 10 large strawberries to be used as a garnish for the cake. Then slice the remaining strawberries, and place them into a medium bowl. Sprinkle the strawberries with the granulated sugar. Mash them slightly with a potato masher. Let this chill until you are ready to assemble the cake, for at least 30 minutes.

Whip the whipping cream in a medium bowl with the electric mixer on a high speed until stiff peaks have formed. Then add the vanilla, and the confectioners sugar, and continue beating this cream until it is mixed.

Now place one cake laiyer on the serving plate, and cover with the mashed strawberries. Then top the strawberries with 1½ cups of whipping cream. Now place the second layer on the top of the whipping cream. Spread this layer with the rest of the whipped cream. Garnish this layer with the remaining strawberries.