Bake as directed on box for 13x9-inch pan. Cool 10 minutes; remove from pan to cooling rack. Cool completely, about 1 hour.
Using serrated knife, cut cake crosswise into thirds. Cut one of the thirds in half crosswise to make 2 squares. On tray, ...
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Using serrated knife, cut cake crosswise into thirds. Cut one of the thirds in half crosswise to make 2 squares. On tray, ...
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