OLD-FASHIONED CHOCOLATE CAKE WITH COCOA FROSTING

Old-Fashioned Chocolate Cake with Cocoa Frosting image

Yield Serves 8 to 10

Number Of Ingredients 16

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For cake
3 cups all purpose flour
2 cups sugar
1/2 cup unsweetened cocoa powder
2 teaspoons baking soda
1 teaspoon salt
2 cups cold water
1 cup corn oil
1 tablespoon vanilla extract
1 1/2 cups semisweet chocolate chips
For frosting
1/2 cup plus 2 tablespoons (1 1/4 sticks) unsalted butter, room temperature
5 cups powdered sugar
8 tablespoons (about) whole milk
1 1/4 teaspoons vanilla extract
3/4 cup plus 3 tablespoons unsweetened cocoa powder

Steps:

Make cake:
Preheat oven to 350°F. Butter and flour three 9-inch-diameter cake pans with 1 1/2-inch-high sides. Sift first 5 ingredients into medium bowl. Mix water, oil and vanilla in large bowl. Whisk in dry ingredients. Divide batter among pans. Sprinkle 1/2 cup chocolate chips over batter in each pan.
Bake cakes until tester inserted into center comes out clean, about 25 minutes. Cool cakes in pans on racks 15 minutes. Cut around pan sides to loosen cakes. Turn cakes out; cool completely.
Make frosting:
Beat butter in large bowl until fluffy. Gradually beat in 3 cups sugar. Beat in 6 tablespoons milk and vanilla. Add cocoa and remaining 2 cups sugar; beat until blended, thinning with more milk if necessary.
Place 1 cake layer, chocolate-chips side up, on platter. Spread 2/3 cup frosting over. Top with second cake layer, chocolate-chips side up. Spread 2/3 cup frosting over. Top with remaining cake layer, chocolate-chips side down. Spread frosting over sides and top of cake. (Can be made 1 day ahead. Cover with cake dome; let stand at room temperature.)