Cream together the butter and powdered sugar until pale yellow.

Add the egg and vanilla and mix.

Add flour, baking soda and salt to butter mixture and blend until a dough forms.

Divide dough into 5 groups.

Add food coloring to each piece of dough.

On a floured piece of parchment paper, add the red dough, roll out into a rectangle about 1/4 of an inch thick then set aside.

Repeat this step with each piece of dough then lay on top of each other in the rainbow order and roll out gently so the dough is roughly 1/2 inch thick.

starting with one of the long sides of the rectangle begin rolling dough until you get to the half way mark in the dough, then you will roll the other side so both sides are connected by one side and the rolled up side is touching the other rolled up side, it will look kind of like a palmier cookie. Rolling the dough like this helps to get a good arch in the rainbow without making it into a total swirl but you can just divide into 2 rectangles and roll up in a swirl.

Wrap dough in the parchment paper you rolled it out in and freeze dough for 20-30 minutes.

Preheat oven to 375 F.

Remove dough from freezer and slice down the middle of the rectangle so the rolls become separate and you will have 2 rolls.

Slice into ~1/3 inch thick slices and place on an un-greased cookie sheet and bake for 10 minutes.

Remove from oven and allow to cool.

Make frosting and pipe little clouds over the ends of the rainbows followed by optional gold sprinkles.