I've been freezing portioned cookie dough for years. However, instead of freezing on a cookie sheet, I use flat plastic containers, such as tupperware. I separate the layers of cookies with waxed paper or parchment. When frozen, I transfer the dough into a ziploc labeled with date, type of cookie, and baking instructions. I can fit the plastic containers in among my other items, and they protects fragile cookies until they're frozen solid.

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