Millionaire's shortbread from The Perfect Cookie: Your Ultimate Guide to Foolproof Cookies, Brownies, and Bars (page 319) by America's Test Kitchen

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Always check the publication for a full list of ingredients. An Eat Your Books index lists the main ingredients and does not include 'store-cupboard ingredients' (salt, pepper, oil, flour, etc.) - unless called for in significant quantity.

Notes about this recipe

  • Tweedles81 on December 18, 2025

    I am very happy with how these turned out, especially on my first try. As someone else noted, the caramel takes longer than the stated 16-20 min timeframe. It was double that for me. I used Diamond Crystal kosher salt and added 1.5 times the amount of salt called for. Next time I would double the salt, as I thought it could use it. I think/ hope this will impress the people I am gifting it to!

  • Shewi128 on June 17, 2022

    I've made this recipe several times, and the bars have turned out great every time. They look more beautiful and fancy than the recipe ingredients would indicate. The caramel always takes longer than the recipe states, so just be prepared for that and go by the thermometer temperature.

  • taste24 on June 18, 2020

    These are outstanding. Perfect combo of shortbread, caramel, and chocolate. I just love this recipe.

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