01 - Preheat your oven to 350°F (175°C). Grease and line two 9-inch (23 cm) round cake pans with parchment paper.
02 - In a bowl, whisk together flour, baking powder, baking soda, and salt.
03 - In a large mixing bowl, beat butter and sugar together on medium-high speed until light and fluffy, about 3–4 minutes.
04 - Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - With the mixer on low, alternate adding the flour mixture and milk, beginning and ending with flour. Mix until just combined—do not overmix.
06 - Divide the batter evenly between the prepared pans. Bake for 28–32 minutes, or until a toothpick inserted into the center comes out clean.
07 - Let cakes cool in the pans for 10 minutes, then turn out onto a wire rack to cool completely.
08 - Beat butter until smooth and creamy. Gradually add powdered sugar, mixing on low. Add vanilla, milk, and salt, beating until fluffy.
09 - Divide the buttercream into separate bowls. Tint each with a different food coloring gel, making as many colors as you wish.
10 - Place one cake layer on a serving plate. Spread a layer of any colored buttercream on top. Place the second cake layer on top and cover the cake completely with a thin “crumb coat” layer of buttercream. Chill for 20 minutes.
11 - Using piping bags or spatulas, randomly apply different colored buttercreams over the cake—let the colors overlap, swirl, and blend for a playful, chaotic look.
12 - Decorate with assorted sprinkles, candies, cookies, and edible glitter. Add freehand piped shapes, zigzags, dots, or words for extra whimsy.
13 - Serve and embrace the chaos!