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The first Top Secret Recipes book features a version of this clone recipe for America's most beloved candy creation, and the recipe is posted all over the place. But since 1993, I've learned a few things about Reese's Peanut Butter Cup cloning. Now, when you make this Reese's Peanut Butter Cups recipe, it's better to use reduced-fat peanut butter for a texture that's drier and crumblier like the original. Also, use scissors to trim paper muffin cups so that they are shallower—and a better mold for your clone.
Source: Top Secret Recipes by Todd Wilbur.