Adapted from The Confetti Cookbook and The Joy of Cooking via How To Cook a Wolf
3 1/2 cups cake flour
1/2 cup unsweetened cocoa (not Dutch processed)
1 1/2 teaspoon salt
2 cups canola oil
2 1/4 cups sugar
3 ounces red food coloring
1 1/2 teaspoons vanilla
1 1/4 cups buttermilk
2 teaspoons baking soda
2 1/2 teaspoons white vinegar
16 ounces cream cheese, cold
12 tablespoons butter, at room temperature
1 tablespoon plus 1 teaspoon vanilla
6 cups powdered sugar, sifted
Preheat oven to 350º. Grease 3 9-inch cake pans with butter and line bottoms with parchment.
Whisk flour, cocoa and salt together in bowl.
Beat oil and sugar in an electric mixer on medium till well blended.
Beat in eggs, one at a time. Lower mixer speed to low (you don't want
any splashing!), and carefully add the red food coloring. Add vanilla,
then alternate flour with buttermilk, starting with half the flour,
then half the buttermilk, the rest of the flour, then ending with
buttermilk. Scrape down the bowl, then mix just briefly till combined.
Place baking soda and vinegar in a dish and stir to combine. Add to batter with mixer running. Beat for just 10 seconds.
Divide batter between the 3 pans. Bake 40-45 minutes or till cake
tester comes out clean. Let cool for about 10-20 minutes, then remove
from pan and peel off parchment. Cool completely before icing.
For frosting, beat cream cheese, butter and vanilla just till blended.
Add powdered sugar slowly (2 cups at a time) and beat till frosting is
smooth and at the correct consistency. You may find you prefer more or
less powdered sugar than called for. Makes 4 cups.