Rhubarb Custard Bars Shortbread Crust (Printable View)

Buttery shortbread crust layered with tangy rhubarb and a silky custard filling.

# Needed Ingredients:

→ Shortbread crust

01 - Unsalted butter, 1 cup (2 sticks), softened
02 - Granulated sugar, 1/2 cup
03 - All-purpose flour, 2 cups
04 - Salt, 1/4 teaspoon

→ Rhubarb layer

05 - Fresh rhubarb, 3 cups, chopped
06 - Granulated sugar, 1/2 cup

→ Custard filling

07 - Large eggs, 3
08 - Granulated sugar, 1 cup
09 - All-purpose flour, 1/2 cup
10 - Heavy cream, 1 1/2 cups
11 - Pure vanilla extract, 1 teaspoon
12 - Salt, pinch

→ Garnish (optional)

13 - Powdered sugar, for dusting, as needed

# Directions:

01 - Preheat oven to 350°F. Grease a 9x13-inch pan and line it with parchment paper, leaving an overhang for easy removal.
02 - In a mixing bowl, cream the softened butter and 1/2 cup sugar until light and fluffy. Add 2 cups all-purpose flour and 1/4 teaspoon salt, mixing just until a soft, cohesive dough forms.
03 - Press the dough evenly into the prepared pan to form a uniform layer. Bake until the edges are lightly golden, about 18 to 20 minutes. Remove from oven and keep oven on.
04 - While the crust bakes, toss the chopped rhubarb with 1/2 cup granulated sugar in a bowl and set aside to macerate briefly.
05 - In a separate bowl, whisk together the 3 eggs and 1 cup sugar until combined. Add 1/2 cup flour, 1 1/2 cups heavy cream, 1 teaspoon vanilla, and a pinch of salt; whisk until smooth and homogenous.
06 - Remove the pre-baked crust from the oven. Spread the sugared rhubarb in an even layer over the hot crust, then carefully pour the custard mixture over the rhubarb to cover it.
07 - Return the pan to the oven and bake until the custard is set and lightly golden on top, about 35 to 40 minutes. The center should be firm to the touch.
08 - Allow the pan to cool completely on a wire rack. When cool, dust with powdered sugar if desired, lift from the pan using the parchment overhang, and cut into 16 bars.
09 - Serve chilled or at room temperature. Refrigerate leftovers in an airtight container for up to 3 days.

# Expert Hints:

01 -
  • The shortbread crust is so buttery and crisp, it’s like a hidden layer of cookie under creamy custard.
  • The tang from fresh rhubarb balanced by sweet custard made me fall for these bars after the first bite.
02 -
  • Once I tried rushing the cooling step, and the bars fell apart into a delicious mess—patience really is key here.
  • I used to skimp on the parchment, but learned the hard way that lining the pan means easy, perfect bars every time.
03 -
  • Always cut with a sharp, hot knife wiped clean between slices for neat edges.
  • A light sprinkle of powdered sugar just before serving looks and tastes best—never dust too early or it disappears.
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