Grease two eight-inch round cake pans. Prepare and bake the cake mix according to package directions.
Allow the cake to cool completely. Tear the cake into bite-sized pieces. Store the cake in an airtight container until ready to use to keep the cake moist.
For the whipped cream
Combine whipped cream ingredients in a chilled metal or glass bowl.
Beat cream on medium-high until stiff peaks form, about 7-10 minutes.
To assemble the trifle:
Spread an single layer of cake on the bottom of a trifle bowl. Spread a layer of whipped cream over top.
Repeat layers, ending with a layer of whipped cream on top.