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Add cocoa to large bowl and whisk to remove lumps (or sift). Add butter and beat until combined.
Add sugar, vanilla, milk, and espresso powder, if using. Beat on low speed until combined; beat on high speed about 2 minutes until fluffy and smooth.
If consistency of frosting is too thin, gradually add more sugar. If the frosting is too thick, add milk a teaspoon at a time until frosting is desired consistency.
Makes enough to frost and fill a 2-layer cake, or to frost 24 cupcakes. Make a half batch for 9 x 13-inch cake unless you like a lot of frosting!