Recipe By Andrea Geary
Published on September 6, 2024
Britain’s triple-decker combo of buttery cookie, sweet caramel, and dark chocolate makes a perfect holiday gift. But only if every layer is flawless.
Time
2 hr 45 minYield
Makes 40 cookiesWhy This Recipe Works
Millionaire’s Shortbread has a lot going for it: a crunchy shortbread base; a chewy, caramel-like filling; and a shiny, snappy chocolate top. The only thing that could make it better would be foolproof methods for producing all three layers. We started by making a quick shortbread with melted butter rather than pulling out the mixer or food processor. Sweetened condensed milk is important to the flavor of the filling, but it also makes the filling vulnerable to breaking because the whey proteins, crucial to keeping the mixture emulsified, have been damaged by heat both during processing and during the cooking of the filling. We added fresh cream to supply just enough whey to keep it together. Melting the chocolate very carefully so that it never got too hot and stirring in grated chocolate at the end created a smooth, firm top layer, which made a suitably elegant finish for this rich yet refined cookie.
Ingredients
Crust
Filling
Chocolate
Instructions
Cook along with these step-by-step instructions
- Adjust oven rack to lower-middle position and heat oven to 350 degrees. Make foil sling for 13 by 9-inch baking pan by folding 2 long sheets of aluminum foil; first sheet should be 13 inches wide and second sheet should be 9 inches wide. Lay sheets of foil in pan perpendicular to each other, with extra foil hanging over edges of pan. Push foil into corners and up sides of pan, smoothing foil flush to pan. Combine flour, sugar, and salt in medium bowl. Add melted butter and stir with rubber spatula until flour is evenly moistened. Crumble dough evenly over bottom of prepared pan. Using your fingertips and palm of your hand, press and smooth dough into even thickness. Using fork, pierce dough at 1-inch intervals. Bake until light golden brown and firm to touch, 25 to 30 minutes. Transfer pan to wire rack. Using sturdy metal spatula, press on entire surface of warm crust to compress (this will make finished bars easier to cut). Let crust cool until it is just warm, at least 20 minutes.
- Stir all ingredients together in large, heavy-bottomed saucepan. Cook over medium heat, stirring frequently, until mixture registers between 236 and 239 degrees (temperature will fluctuate), 16 to 20 minutes. Pour over crust and spread to even thickness (mixture will be very hot). Let cool completely, about 1 1/2 hours.
- Microwave chopped chocolate in bowl at 50 percent power, stirring every 15 seconds, until melted but not much warmer than body temperature (check by holding in palm of your hand), 1 to 2 minutes. Add grated chocolate and stir until smooth, returning to microwave for no more than 5 seconds at a time to finish melting if necessary. Spread chocolate evenly over surface of filling. Refrigerate shortbread until chocolate is just set, about 10 minutes.
- Using foil overhang, lift shortbread out of pan and transfer to cutting board; discard foil. Using serrated knife and gentle sawing motion, cut shortbread in half crosswise to create two 6 1/2 by 9-inch rectangles. Cut each rectangle in half to make four 3 1/4 by 9-inch strips. Cut each strip crosswise into 10 equal pieces. (Shortbread can be stored at room temperature, between layers of parchment, for up to 1 week.)
CRUST
FILLING
CHOCOLATE
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