Step 1: Step 1
First prepare your Betty Crocker's yellow cake as usual and separate it in 6 vases. Each for every color. I used Red, Orange, Yellow, Green, Cyan and Purple.
Step 2: Step 2
Use gel food coloring for each one. One drop will be enough. If not, then just add one more.
Step 3: Step 3
Once you color it, pour it into a round pyrex. First the red and wait for it to cover the whole base. Then the other colors in order, pour them right in the center one by one and you'll get that effect.
Step 4: Step 4
Once the cake is ready and baked you'll get something like the picture or better. I recommend to slice the top of the cake for better coverage with the frosting.
Step 5: Step 5
Once you have the cake cover it with whatever frosting you like. I used 3 egg whites and 1 bag of powder sugar with a squeeze of lemon. And add sprinkles.
Step 6: Step 6
Serve and Enjoy!