01 -
Rinse cranberries and remove any soft or damaged berries. Combine cranberries, water, and 6 tablespoons granulated sugar in a medium saucepan. Bring to a gentle boil over medium-high heat. Reduce to medium-low, cover with lid or splatter screen to contain bursting cranberries, and simmer for 10–15 minutes, stirring frequently. Cook until cranberries are completely broken down and the mixture is thick and jam-like. Set aside to cool for at least 30 minutes.
02 -
Preheat oven to 325°F. Line a 9-inch square baking pan with parchment paper, leaving overhang on two sides for easy lifting. Ensure parchment completely covers sides and corners. Lightly coat with butter or nonstick spray.
03 -
In a medium mixing bowl, stir together melted butter, vanilla extract, 1/4 cup granulated sugar, and salt until fully combined. Add 1 cup plus 1 tablespoon flour and mix until a thick dough forms.
04 -
Firmly press dough into even layer over bottom of prepared pan, using hands or bottom of a measuring cup for a compact, uniform base. Bake for 16–18 minutes until edges are lightly golden and crust is set. Remove from oven and immediately pierce crust all over with fork to release steam. Allow crust to cool on wire rack for 20 minutes.
05 -
Whisk together 3 tablespoons flour and 1 cup granulated sugar in a medium bowl. Add eggs and beat until fully blended and smooth. Stir in fresh lemon juice and whisk until pale yellow and lightly frothy. Let rest at room temperature.
06 -
Spread cooled cranberry filling evenly over completely cooled crust to the edges, smoothing the surface. Refrigerate the pan for 45 minutes to set the cranberry layer.
07 -
Preheat oven to 350°F. Remove pan from refrigerator. Gently pour lemon custard over firm cranberry layer, spreading evenly. Bake for 43–45 minutes, until custard is set and center does not jiggle when lightly shaken. Tiny surface bubbles may form.
08 -
Remove pan from oven. Cool on a wire rack at room temperature for 1 hour. Transfer to refrigerator and chill for 1–2 hours to fully set layers and ensure clean slicing.
09 -
Lift bars out of pan using parchment overhang and place on cutting board. Generously dust with powdered sugar through a fine-mesh sieve for even coverage. Slice into squares with a sharp knife, wiping the blade clean between cuts. Serve chilled or at room temperature.