Happy Birthday to my wonderful, amazing baby sister. You are an incredible woman and I am lucky to have you in my family. I am so glad that my nephew is getting a baby sister, because really, a little sister is the best gift I have ever gotten.
This ruffle cake is really pretty easy. I made a 6 inch cake 3 layers high. A box of cake mix will make a 3 layer 6 inch cake. To make the ruffled sides, use a Wilton #104 tip and place the tip perpendicular to the cake with the fat end of the tip toward the cake. The trickiest bit is keeping your lines straight. As you can see, I did not do a killer job at that :) I put a crumb coat on the cake, but it wasn't necessary. The ribbon frosting takes a lot of icing, so with the crumb coat there was too much frosting and I had to make more than my usual one batch of icing. The writing was done in a Wilton #3 tip and the swirls for the boarder were done with a Wilton #18 tip. I used a buttercream that was part shortening because I wanted the frosting to hold up on a two hour car ride, plus is makes the piping a bit crisper. I prefer the flavor of straight butter buttercream, so if you are keeping it local and making it on a cool day that is what I would recommend.
Buttercream1 cup vegetable shortening
1 cup butter
2 pound bag powdered sugar (about 8 cups)
2 teaspoons vanilla
4-6 tablespoons water (to thin)