Millionaire's Shortbread with Chewy Caramel and Snappy Dark Chocolate

By Sprig Originals ✓ · cooked up in Sprig

Three layers, three distinct textures: a sandy-crisp all-butter shortbread base, a true cooked caramel that sets chewy and sliceable instead of oozing, and a thin sheet of seed-tempered dark chocolate that snaps under a knife rather than shattering. A candy thermometer and a hot knife are the only tricks you need — the rest is patience while each layer sets.

Ingredients

• 1 cup unsalted butter, softened (226 g)
• 1/2 cup granulated sugar (100 g)
• 1/4 cup powdered sugar (30 g)
• 1 tsp vanilla extract
• 3/4 tsp fine sea salt
• 2 cups all-purpose flour (250 g)
• 2 Tbsp cornstarch

• 1 14-oz can sweetened condensed milk
• 1/2 cup unsalted butter (113 g)
• 1/2 cup packed light brown sugar (110 g)
• 3 Tbsp golden syrup or light corn syrup
• 3/4 tsp fine sea salt
• 1 tsp vanilla extract

• 8 oz good dark chocolate, 60–70% (225 g), finely chopped
• 1 tsp flaky sea salt, for finishing

Instructions

1. Heat the oven to 350°F. Line a 9x9-inch metal baking pan with two crossed strips of parchment, letting them overhang on all four sides for lifting later. Lightly butter the pan first so the parchment stays put.
2. Make the shortbread: beat the softened butter, granulated sugar, powdered sugar, vanilla, and 3/4 tsp fine salt with a mixer on medium for 1 to 2 minutes, just until creamy and combined — do not whip it airy. Add the flour and cornstarch and mix on low until the dough looks like damp, clumpy sand and no dry flour remains, about 1 minute.
3. Dump the crumbs into the pan and press them into a firm, even slab with your fingers, then smooth and compact the surface with the flat bottom of a measuring cup, working the dough into the corners. Prick the surface all over with a fork about 30 times.
4. Bake 28 to 32 minutes, until the top is pale gold and the edges are a shade darker. Set the pan on a rack and, while the shortbread is still hot, gently re-compact the surface with the measuring cup to close any puffed spots. Cool at least 30 minutes; the base should be no warmer than lukewarm before the caramel goes on.
5. Make the caramel: combine the condensed milk, butter, brown sugar, golden syrup, and 3/4 tsp fine salt in a heavy 3-quart saucepan over medium heat. Stir with a heatproof spatula until the butter melts and the mixture is smooth.
6. Clip on a candy thermometer and cook, stirring constantly and scraping the bottom and corners of the pan, for 10 to 15 minutes. The caramel will thicken, darken to a deep peanut-butter color, and pull away from the spatula in a sheet. Take it off the heat the moment it reaches 226°F (108°C) — that reading is what makes it chewy and sliceable rather than runny.
7. Stir in the vanilla, then immediately pour the caramel over the cooled shortbread and tilt the pan or spread quickly with an offset spatula to level it. Let it set at room temperature for at least 1 hour, until firm and no longer warm to the touch (30 minutes in the refrigerator also works).
8. Temper the chocolate the easy way: put three-quarters of the chopped chocolate in a dry heatproof bowl and microwave in 20-second bursts, stirring between each, until melted and 113 to 118°F. Add the remaining quarter of the chopped chocolate and stir patiently for 2 to 4 minutes until every piece is dissolved and the chocolate reads 88 to 90°F. If stray bits remain, stir in a warm room until they melt rather than reheating.
9. Pour the tempered chocolate over the set caramel, spread it thin and even with an offset spatula, and tap the pan once on the counter to settle it. Scatter flaky salt over the top after 3 minutes, once the surface has lost its wet shine.
10. Let the pan sit at cool room temperature (65 to 70°F) for 1 to 2 hours until the chocolate is fully set and matte-glossy. Do not refrigerate at this stage — chilled chocolate cracks and blooms.
11. Lift the slab out by the parchment onto a cutting board. Dip a large sharp chef's knife in hot water, wipe it completely dry, and press straight down through the chocolate in one motion; repeat, rewarming and wiping the blade between every cut. Cut 4 rows by 4 for chunky bars, or 4 by 8 for slim fingers. Store airtight at room temperature up to 5 days.

Chef's tips

Nutrition (per serving, estimated)

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