Bottom: Lubricate and grind a mold with removable edge, 15 cm in diameter (for 10 pieces).
Mix half of all the ingredients to the bottoms, except the household paint, in a bowl. Whisk quickly to a smooth batter using an electric whisk.
Divide the batter into three bowls, use a scale to get bottoms that are evenly thick.
Color one of the butterflies in yellow, one in orange and one in red. Mix in so much color to make you happy with the color. Spread out a batter in the mold. Bake in the middle of the oven for about 25 minutes, making sure that the cake is ready-baked. Allow to cool for a few minutes before putting the cookie bottom on a grill to cool completely. Bake the remaining bottoms.
Repeat and color the other three bottoms in purple, blue and green.
Frosting: Mix all the ingredients for the frosting in a bowl. Stir until completely smooth. Set cold.
Mounting: During baking, the cake often becomes topped in the middle and a little bubbly in the surface. Therefore, level the bottoms so that they become evenly flat by cutting off a piece of the top layer.
Place the purple bottom on a barrel and wide on some of the frosting, preferably use a pallet otherwise a lick pot will work well too.
Repeat with the other bottoms in the color scheme blue, green, yellow, orange and red. Spread the remaining frosting in an even layer all around the cake.
