Catalogue for treats?!

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Hi all, just started using MFP today, I wondered if there was any tool which helps with using any remainder calories? For example today I had a few calories spare at the end of the day but as I'm new to calorie counting I hadn't a clue what I would be able to have for e.g. 20 calories. Not sure if there's anything out there (aside from general internet!) where can pop in a number of calories and a list comes up with what you could have for those calories?!
Many thanks!
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