The best way to ice the top of a cake without mixing crumbs in with the icing is to deposit a generous quantity of icing on the center of the cake and push it toward the edges with a spatula.

Question

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Starting with a generous amount of icing in the center and gently pushing it towards the edges minimizes the spatula's contact with the cake surface, reducing the likelihood of picking up crumbs.

The Best Way to Ice the Top of a Cake