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Slice into wedges to serve right away, or cool to room temperature before cutting. Makes 8 servings. Icing: Melt 1/4 cup unsalted butter with 2 tablespoons cocoa powder in a saucepan over medium heat.

Sheet cake sizes vary, and that impacts how many people you can feed.Key TakeawaysSheet cakes come in three standard sizes: quarter (9 x 13 inches), half (13 x 18 inches), and full (18 x 26 ...