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A close-up of delicious Lemon Raspberry Swirl Bars with a buttery shortbread crust and vibrant raspberry swirls.

Sunshine Lemon Raspberry Swirl Bars

These bars feature a buttery, melt-in-your-mouth shortbread crust, a bright and tangy lemon custard filling, and a beautiful, sweet swirl of raspberry jam. Each bite delivers a perfect trifecta of textures: the sandy crunch of the crust, the smooth lemon filling, and a sweet burst of berry.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 16
Course: Dessert, Snack
Cuisine: American
Calories: 220
Ingredients Equipment Method Notes

Ingredients
  

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Equipment

  • 8x8 inch or 9x9 inch baking pan
  • Parchment paper
  • Medium bowl
  • Large bowl
  • Whisk
  • Pastry cutter or fork
  • Measuring cups and spoons
  • Citrus zester or microplane
  • Juicer
  • Butter knife or skewer
  • Wire cooling rack
  • Sharp knife
  • Cutting board

Method
 

  1. Preheat your oven to 350°F (175°C). Line an 8x8 inch baking pan with parchment paper, leaving an overhang on the sides to use as handles.
  2. In a medium bowl, whisk together the flour, 1/2 cup of granulated sugar, and salt for the crust. Add the cold, cubed butter. Use a pastry cutter or your fingertips to cut the butter into the mixture until it resembles coarse crumbs.
  3. Press the crust mixture firmly and evenly into the bottom of the prepared pan. Bake for 18-20 minutes, until the edges are lightly golden. Leave the oven on.
  4. While the crust bakes, prepare the filling. In a large bowl, whisk together the 1 1/2 cups of granulated sugar and the lemon zest until the sugar is fragrant. Whisk in the eggs until combined, followed by the lemon juice and the 3 tablespoons of flour. Continue whisking until the mixture is completely smooth.
  5. Once the crust is par-baked, reduce the oven temperature to 325°F (160°C). Pour the lemon filling evenly over the hot crust.
  6. Warm the raspberry jam in a microwave-safe bowl for 15-20 seconds to loosen it. Drop small spoonfuls of the jam over the surface of the lemon filling.
  7. Take a butter knife or a skewer and gently drag it through the jam dollops to create a marbled swirl pattern. Be careful not to overmix.
  8. Bake for 25-30 minutes, or until the filling is just set. The center should have only a very slight jiggle when the pan is gently shaken.
  9. Remove the pan from the oven and let it cool completely on a wire rack for at least 1 hour. Then, transfer the pan to the refrigerator to chill for at least 3 hours, or preferably overnight, to allow the filling to set firmly.
  10. Once fully chilled, use the parchment handles to lift the bars out of the pan. Place on a cutting board and use a sharp, clean knife to cut into squares. Dust with powdered sugar before serving, if desired.

Notes

{tips=For a deeper, nutty flavor, make a brown butter crust by melting and browning the butter before adding it to the dry ingredients. For an elegant touch, add a white chocolate drizzle after the bars have cooled. A tiny drop (1/8 tsp) of almond extract in the crust can enhance the raspberry flavor., troubleshooting=To prevent a soggy crust, ensure it is par-baked until the edges are golden. Avoid overbaking the filling to maintain a silky, custard-like texture. It is critical to cool the bars completely before cutting to ensure clean, neat squares., storage=Store the bars in an airtight container in the refrigerator for up to 5 days. They are best served chilled., variations=For a gluten-free version, use a 1-to-1 gluten-free baking flour. You can substitute raspberry jam with strawberry, blackberry, or apricot preserves. For a different citrus twist, try using Meyer lemons or limes.}