100% home made cake.

Yellow buttermilk cake, it turned out just ok, a bit grainy and over sweet.

Buttercream frosting however was perfect.
1 cup plus 2 tablespoons sugar
5 large egg whites, room temperature
Pinch of salt
1 pound (4 sticks) unsalted butter, softened, cut into pieces
1 1/2 teaspoons pure vanilla extract

Place sugar, whites, and salt in a heatproof mixer bowl set over a pot of simmering water. Whisk until sugar dissolves and mixture registers 160 degrees on a candy thermometer.
Attach bowl to mixer. Whisk on medium speed for 5 minutes. Increase speed to medium-high, and whisk until stiff, glossy peaks form, about 6 minutes. Reduce speed to medium, and add butter, 1 piece at a time, whisking well after each addition. Whisk in vanilla. Use immediately, or cover, and refrigerate for up to 3 days. (Bring to room temperature, and beat on low speed until smooth before using.)

It beats any powdered sugar recipe hands down.

I only had a ziplock bag to decorate with, and i'm not very good at that so forvive the sloppy edges.