Chocolate Dulce de Leche Bars
['1 stick unsalted butter, softened', '1/3 cup packed light brown sugar', '1/2 teaspoon pure vanilla extract', '1/2 teaspoon salt', '1 cup all-purpose flour', '1 cup heavy cream', '1 cup dulce de leche', '4 large egg yolks', '5 ounces 60%-cacao bittersweet chocolate', 'finely chopped (preferably in a food processor)']
Preheat oven to 375°F with rack in middle. Butter a shallow 9- to 9 1/2-inch square baking pan (1 to 1 1/2 inches deep). Line bottom and 2 sides with parchment paper, leaving an overhang. Butter parchment.
Blend together butter, brown sugar, vanilla, and salt in a bowl with a fork. Sift in flour and blend with fork until a soft dough forms.
Spread dough evenly in baking pan using an offset spatula or back of a spoon, then prick all over with fork.
Bake until golden, 15 to 20 minutes, then cool completely in pan on a rack, about 30 minutes.
Bring cream and dulce de leche to a simmer in a small heavy saucepan, stirring with a wooden spoon until dulce de leche has dissolved.
Whisk together yolks in a bowl, then slowly whisk in hot cream mixture. Return to pan and cook over medium heat, stirring constantly, until pan is visible in tracks of spoon and mixture registers 170°F on an instant-read thermometer. Remove from heat and whisk in chocolate until melted.
Pour chocolate mixture over cooled shortbread and chill, uncovered, until cold and set, about 2 hours.
Run a small knife around edges to loosen, then transfer to a cutting board using parchment. Cut with a hot clean knife (dip in hot water and wipe clean between cuts) into 24 bars. Chill until ready to serve.
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