If you are planning to pipe the frosting on top; double the butter/cream cheese frosting. If you are just going to spread it with a knife, a single batch should be sufficient. I ran out of frosting midway through and had to run out and buy more cream cheese. Then I had to mix the frosting up by hand once again. I think whipping the second batch of frosting gave me mild carpal tunnel. I swear one of these days I will buy a mixer and be cool and wrist pain free like the rest of America.
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