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For the Cake
Preheat oven to 350 degrees F. Lightly spray pans with non-stick spray or Wilton cake release. Place the cake mix, jello, strawberries, oil, milk, and eggs in the bowl of your electric mixer. Mix 3 minutes, stopping to scrape the sides of the bowl a couple of times.
Divide the batter evenly among layer pans or pour into a 9x13 inch baking pan. For 9x13 pan bake 28 minutes or until a toothpick inserted in center comes out clean. (Cook layers according to directions on the box of cake mix.) Cool the cake layers 10 minutes in the pan before removing to a wire rack. Wait until the cake is completely cool before frosting.
For Cream Cheese Frosting:
Besat the cream cheese and butter until smooth. Sift sugar and add one cup at a time to the cream cheese mixture. Add heavy whipping cream and strawberries and incorporate completely.
For a more professional cake, remove the domes from the tops of the cake layers with a cake leveler or large serrated knife. Place one layer of cake on a serving plate. Spread about 1 cup of the frosting on top in an even layer. Repeat with the next layer of cake and frosting, then top the cake with the final layer of cake (if you have 3 layers). Frost the outside of the cake. An offset spatula makes it really easy to get an even layer.
Cooking times for pan size
two 9-inches round or 9x9 inch square 28 to 31 minutes
two 8-inch round or 8x8-inch square 30 to 33 minutes
three 8-inch round 28 to 30 minutes