RainBow Cake

I made this cake as a test, I will make it again on Saturday for an 10 year old girls birthday. I must warn you its  pretty labor intensive cake, but if you have baking skills it should be no problem. I calls for 5 egg whites, if you save the egg yolks, I have an amazing recipe for lemon curd... But the cake was sooo fun and its yummy all the same.

Cake Ingredients

1c butter
2 1/3c sugar
5 egg whites, room temp
2tsp vanilla
3c  flour
4tsp baking powder
½ tsp salt
1 1/2 c milk, warmed for 30 sec in microwave to bring to room temp
Red, orange, yellow, green, blue and purple GEL food coloring, if you use liquid use a lot.

Method
Preheat the oven to 350° Grease how ever many 9” cake pans you have, you can bake in shifts if you don't have 6. It makes most sense to bake 3 at a time anyway.

Sift together the flour, baking powder and salt. Set aside.
Cream the sugar and butter, then add the egg whites, and add them a little at a time. Add the vanilla and mix until fully incorporated. Then, alternating between wet and dry, add the milk and flour mixture in two parts.

Divide the batter evenly between 6 bowls, It's about 1 c each, and then mix a fair amount of the appropriate food color into each bowl. Keep in mind that the color of the unbaked batter will be the color of the baked batter. Pour into the pans and bake for 15 minutes each or until toothpick inserted comes out clean.
Remove them from the oven, let them rest on the cooling rack, in the pan, for ten minutes. Then flip onto a cooling rack and cool completely before frosting.

Frosting Ingredients
4c butter
2tsp lemon extract
4c powdered sugar
1/2 c heavy whiping cream

Method
Cream butter until creamy, add sugar slowly, beat until creamy, add extract and cream until whipped creamy.You are ready to frost the cake.

First starting with purple on the bottom frost generously between layers, I used a whole ice cream scooper and some, level out, repeat next blue, green, yellow, orange, red. And finally frost sides and top until completely covered.