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Butter Tart Squares

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These Butter Tart Squares deliver all the gooey, caramelized sweetness of traditional butter tarts in an easy-to-make bar form. With a buttery shortbread crust and a rich filling, these squares are perfect for a dessert platter or a sweet snack with coffee or tea.

Ingredients

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For the Crust:

  • 1 cup all-purpose flour
  • 1/4 cup granulated sugar
  • 1/2 cup cold butter, cubed

For the Filling:

  • 2 large eggs
  • 1 cup packed brown sugar
  • 1/4 cup melted butter
  • 1 tablespoon all-purpose flour
  • 1 tablespoon white vinegar
  • 1 teaspoon vanilla extract
  • 1/2 cup raisins or chopped walnuts (optional)


Instructions

  1. Preheat the oven to 350°F (175°C). Grease or line an 8×8-inch baking pan with parchment paper, leaving some overhang for easy removal.
  2. Make the crust: In a medium bowl, mix together the flour and granulated sugar. Cut in the cold butter with a pastry cutter or fork until the mixture resembles coarse crumbs.
  3. Press the crust mixture firmly and evenly into the bottom of the prepared pan. Bake for 10–12 minutes, or until lightly golden.
  4. Prepare the filling: In a separate bowl, whisk together the eggs, brown sugar, melted butter, flour, vinegar, and vanilla extract until smooth. Fold in the raisins or walnuts if desired.
  5. Pour the filling over the pre-baked crust, spreading it evenly.
  6. Bake for 25–30 minutes, or until the filling is set and golden brown. The center should still have a slight jiggle.
  7. Cool completely in the pan before cutting into squares. Use the parchment overhang to lift the squares out easily.
  8. Serve and enjoy! Store leftovers in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.


Notes

  • Add-Ins: Customize the filling with your favorite additions like pecans, chopped nuts, or chocolate chips.
  • Vinegar: The vinegar balances the sweetness and enhances the caramel flavor. It won’t leave a noticeable taste.
  • Cutting Tip: For clean slices, chill the bars for 15–20 minutes before cutting.