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By America’S Test Kitchen he Associated Press

A simple American buttercream improves a flag sheet cake

A big flag sheet cake is the perfect Canada Day dessert; and at a time when patriotic-colored berries are at their best, vibrant blueberries and red raspberries are a fitting topping.

We knew that our workhorse Yellow Sheet Cake was the ideal base for the cake, so our challenge when developing this recipe was simply determining the best frosting.