Why Costco sheet cake needs to be refridgerated
Making room in your fridge for a Costco sheet cake may seem straightforward, but preparing in advance helps prevent the dessert from sitting out on the kitchen counter for too long. With its buttercream frosting and layers of vanilla and chocolate mousse, these custom cakes are dairy-based and need to be refrigerated promptly for both quality and food safety. The U.S. Food and Drug Administration recommends that perishable items should not be left at room temperature for more than two hours; in hot weather—specifically above 90 degrees Fahrenheit—it's only safe to leave the cake out for one hour. The last thing you want is for the frosted cake to turn into a melted disaster. Therefore, depending on how far you have to travel from your nearest Costco, it's best to refrigerate the cake as soon as you get home.
Since buttercream frosting can harden in the fridge, be sure to take the cake out at least half an hour before you plan to slice it, allowing it to soften. Fortunately, the airtight plastic container that comes with Costco's sheet cakes will help keep the frosting from drying out and cracking. If you're planning to bring a cake home a week or more before an event, you can freeze it for long-term storage. This method is also an excellent way to store any leftovers, allowing you to reclaim that precious fridge space after serving the cake.
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