A fun summer cake to make to mimic the sweetest summer fruit! This Watermelon cake is as fun to make as it is to eat!
Easy Watermelon Cake idea at www.thatswhatchesaid.com

Do you have a watermelon lover in your life?  This Easy Watermelon Cake is a huge hit at summer picnics or just because!  My secret:  It’s made from a box mix and canned frosting!  Would you ever have guessed?  It’s so easy and fun and a Watermelon Cake is sure to brighten any day!

It turned out better than I expected!!  From the outside it just looks like a green cake…boring right?  Just wait until you hear all the ooh’s and ahhs when you cut into this beauty exposing the pink and chocolate seeded insides!

DIY Watermelon Cake!
It was the face of the sun here that day so the icing is a little melty!

How to Make a Watermelon Cake:

I mixed the cake batter as directed on the box (keeping out 1 teaspoon of dry mix – set aside).  Add as many drops of red food coloring you need to in order  to make it a watermelon red/pink color.

Next I am going to add in my “seeds” which are just mini chocolate chips!  I find the mini ones worked perfectly!
NOTE:  To prevent all the chips from sinking to the bottom of the cake while baking, dust the chips with the teaspoon of dry cake batter you set aside before folding them into the wet batter.  This will help the chips to stay suspended throughout your cake!

I baked according to the box directions in (2) 8″ round pans.  (I baked for 27 minutes)

Separate 1/2 of one can of frosting  in a small bowl and set aside.  Put the remaining half of the container and entire second container of frosting in another bowl.   I like to make sure we have frosting on our cakes in this house!!

Add red food color to the first bowl with only half a can in it.  Make it as close to the batter color you can.  This will be the frosting between the 2 cakes.  You want it pink because when you slice a piece you want it to represent the flesh of the watermelon.

Easy Watermelon Cake idea at www.thatswhatchesaid.com

Add green food coloring to the remaining icing to a rich green for the rind color.

Easy Watermelon Cake idea at www.thatswhatchesaid.com
Once the cakes have completely cooled, trim the top of  one of your cakes with a bread knife so it has a flat top.   Slap on the red/pink icing, leaving 1/4 inch gap around the edge of the cake.  When you stack the second layer, the cake will squish the icing to the edges.  Be sure not to get the icing on the sides of the cake, just the top of the first slab.Next stack the second cake.  Finish frosting with the green icing for the rind.  You can be messy with it as to provide a bit of texture to represent the lines in the rind of a watermelon!   I took my icing spatula and made “ridges” in the cake to make the rind texture.


Cut a pie piece of the cake and serve on it’s side as a watermelon slice!

Easy Watermelon Cake idea at www.thatswhatchesaid.com

The cake was a hit!

Easy Watermelon Cake idea at www.thatswhatchesaid.com
0 from 0 votes


  • 1 box white cake mix, (plus ingredients found on box)
  • 2 cans store-bought containers of white icing
  • Mini Chocolate Chips
  • drops Red food color
  • drops Green food color


Cake Directions

  • Prepare the cake batter as directed on the box, reserving 1 teaspoon of dry mix.
  • Add 3/4 cup of MINI chocolate chips and fold these by hand
  • *Dust the chips with the reserved dry cake batter before adding to wet mix
  • Bake according to box directions

Icing Direcctions

  • Separate 1/2 of one can of frosting into a small bowl and set aside.
  • Add the remaining 1 1/2 cans to a larger bowl.
  • Add Red food color to the smaller portion until a nice pink is formed
  • Add Green food color to the larger portion until it resembles a rind.
  • Add your first cake layer and top with pink icing. Add second cake layer and ice entire cake with green icing.
  • Enjoy!


UPDATE:  They now sell pink cake mix and green icing ready to go so food coloring would not be needed!
© That’s What Che Said, LLC. All images & content are copyright protected. Please do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words, or link back to this post for the recipe.
Tried this recipe?Mention @thatswhatchesaidlife or tag #thatswhatchesaid!

If you like watermelon things, you will love my Watermelon Rice Krispie Treats

Watermelon Rice Krispie Treats

And my super easy Watermelon Cookies!

Super Easy Watermelon Cookies at www.thatswhatchesaid.com

Follow Me on Pinterest