Rolling them out: I find that making the cookies about 1/8-inch thick works best. Any thinner and they'll be too fragile, and any thicker and they might not cook in the middle.
Use a piping bag: You'll get a tidier result if you pipe in the filling instead of just spooning it in.
Check for doneness: Once the cookies are golden brown on the edges, they're ready to come out of the oven.
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