A surprise inside cake looks simple enough. It’s a cake of any flavor with a design or different color cake inside of it. One complaint I’ve seen pop up in a lot of conversation about surprise inside cakes is that the design typically ends up dry since it’s baked twice. Having baked one now, I can see how easily that can happy but I also see room for tweaks to prevent that from happening.
For this experiment, I kept the cake simple so that I could focus on trying my hand at the technique. To figure out my approach, I checked out cakes by i am baker and My Cupcake Addiction. I love the colors in My Cupcake Addiction’s love heart cake and may try that as a rainbow surprise in a future surprise inside cake. For my first try, I opted to use a ghost cookie cutter to make Pinky, one of the Pac-Man ghosts.
Surprise Inside Cake
1 box of white cake mix
1 box of devil’s food cake mix
Prepare one box of white cake mix either by using the instructions on the box or by the modified box method substituting melted butter for oil and milk for water. Add desired color (in this case, I added red with a dab of black to get a muted pink color). Line a cookie sheet or sheet pan with parchment paper and pour batter onto pan. Bake at 350F for 23 mins (or as described on the box).
Place a piece of parchment paper on a cutting board large enough to place the cake on. When the cake comes out of the oven, place the paper and cutting board on top of the cake and flip it so that the cake sits on the board. Lift the pan and peel off the parchment paper that is now on top. Pop the cake on the board into the freezer for 10-30 mins to firm up. This will help prevent the cake from crumbling as much when you use the cutter. Select a cookie cutter for your design and make sure it’s small enough to sit in the cake pan you’re using for the final cake. My ghost cutter ended up being slightly taller than what I needed it to be. Remove the sheet cake from the freezer. Flip the cake over again and remove the parchment paper. Trim the top of the cake with a knife to remove the browned part of the cake and reveal the brighter colors underneath. Use the cutter to cutout shapes from the sheet cake. Cut the shapes close to each other to maximize the number of cutouts. Any extra make tasty snacks.
Arrange the cutouts on the same cutting board and pop the board back in the freezer for at least 30 mins (I did 30 but will let them freeze longer next time to better prevent the moist batter of the second cake from soaking into the cutouts).
Prepare the second box mix as above (either via the box or modified). Using a rubber spatula, place some of the batter on the bottom of a greased and floured bundt cake pan and spread it out to cover the bottom of the pan. My Cupcake Addiction suggests a half inch of batter. Bake this layer of batter at 350F for 7 mins.
Take the pan out of the oven and immediately spread a layer of raw batter on top of the baked layer in the pan. The new batter will thin out quickly since it’s going on top of hot cake. These layers of cake and batter will help to hold the cutouts in place. Take the cutouts out of the freezer and start placing them in the pan. The top of the cutout should be in the bottom of the pan (remember, the cake is upside-down in the pan). The cutouts can be arranged close to each other or with lots of space in between depending on how your want your slices to look. A more spaced out arrangement will result in not knowing whether you’ll get an all devil’s food slice or a slice with a surprise design when the cake is served. If you do a more crowded arrangement, leave some space for batter in between. Don’t press them together too tightly.
Place the rest of the batter into a large piping bag. Cut a wide tip at the bottom. Using the bag helps to get the batter between the cutouts and between the cutouts and the edges of the pan. Pipe the batter into all the sections around the cutouts. After filling the sides and in between, pipe the batter on the top of the cutouts to cover them. Since my ghost cutouts were a bit too tall, my batter did not completely cover them. I used a rubber spatula to try to coat exposed areas of cutouts with batter to encourage the cake to cover them all. When done, tap the pan on the counter a few times to get the batter to fill any gaps. Bake at 350F for 33-35 mins (or as long as directed on the box). Let the cake cool in the pan for 15 mins before flipping it over. The cake should release easily. When ready to serve, cut slices and enjoy the surprise image inside.