Lemon Blueberry Bars

A buttery shortbread crust topped with a tangy, vibrant lemon filling and bursting with fresh, juicy blueberries.

By Cressio Rinaldi

Lemon bars are one of the great dessert-table classics: a crisp shortbread base with a sweet-tart, silky lemon filling. This version adds fresh blueberries, which burst as the bars bake and leave little purple pockets of juicy fruit through the filling.

The recipe has two stages. The crust is baked first, alone, until lightly golden. This is called blind baking, and it keeps the base crisp. The filling is whisked together while the crust bakes, poured over the berries and baked until set. After that, the hardest step is waiting, because the bars need to cool completely before slicing.

It makes 12 bars in a 9x9 inch pan, and takes about 50 minutes, plus cooling. Use real lemon juice, and the flavor will make you glad you did.

Read this first

1. Bake the crust first, alone. This keeps it crisp.
2. Use fresh lemon juice and zest, not bottled.
3. Cool completely before cutting. Chilling helps for clean slices.

Prep time: 15 mins · Cook time: 35 mins · Serves 12

Ingredients

• 1.5 cups All-purpose flour
• 1/2 cup Powdered sugar
• 3/4 cup (1.5 sticks) Unsalted butter, cold and cubed
• 1 cup Granulated sugar
• 3 Large eggs
• 1/2 cup Fresh lemon juice
• 1 tbsp Lemon zest
• 1.5 cups Fresh blueberries

Instructions

1. Preheat your oven to 350°F (175°C) and line a 9x9 inch baking pan with parchment paper. Look for: A hot oven, and a lined pan with parchment hanging over the sides.
2. For the crust: Use a food processor or pastry blender to cut the cold butter into 1 cup of flour and the powdered sugar until it resembles coarse crumbs. Look for: A sandy, crumbly mixture with a few pea-sized pieces of butter.
3. Press the crust mixture firmly into the bottom of the prepared pan. Bake for 15 minutes until lightly golden. Remove from the oven. Look for: A golden, firm crust, with slightly darker edges.
4. While the crust bakes, whisk together the granulated sugar, remaining 1/2 cup flour, eggs, lemon juice, and lemon zest until smooth. Look for: A smooth, pale yellow liquid with no streaks of flour and a sharp lemon smell.
5. Scatter the fresh blueberries evenly over the warm, baked crust. Look for: Blueberries sitting in a single, even layer on a warm crust.
6. Pour the lemon filling over the blueberries in the pan. Look for: Filling just covering the berries, with some berries poking up.
7. Return the pan to the oven and bake for another 20-25 minutes until the filling is set and no longer jiggles. Look for: A set, matte filling, with a slight golden edge, and no jiggle when you shake the pan.
8. Let the bars cool completely to room temperature before slicing and dusting with extra powdered sugar. Look for: Clean, firm squares that hold their shape, with a dusting of powdered sugar.

Nutrition

Amount per serving. Nutritional values are estimates calculated from the ingredients above and can vary.

• Calories: 290
• Fat: 14g
• Saturated Fat: 8g
• Carbohydrates: 38g
• Fiber: 1g
• Sugar: 25g
• Protein: 4g
• Sodium: 20mg
• Cholesterol: 80mg

Notes

• Storage: Refrigerate in an airtight container for up to 5 days — the citrus filling keeps best chilled.
• Freezing: Freeze the bars without the powdered sugar dusting for up to 2 months; add the sugar after thawing.
• Clean Slices: Chilling the bars fully before slicing, and wiping the knife between cuts, gives the cleanest squares.

Cook It With Me

Prep

Preheat the oven to 350 F (175 C). Line a 9x9 inch baking pan with parchment paper, leaving an overhang on two sides so you can lift the bars out.

Make the crust

In a food processor or with a pastry blender, cut the 3/4 cup of cold, cubed butter into 1 cup of the flour and the 1/2 cup of powdered sugar, until the mixture looks like coarse crumbs.

Bake the crust

Press the mixture firmly into the bottom of the pan, and bake for 15 minutes, until lightly golden. Remove it from the oven but leave the oven on.

Make the filling

While the crust bakes, whisk together the 1 cup of granulated sugar, the remaining 1/2 cup of flour, the 3 eggs, the 1/2 cup of lemon juice and the 1 tablespoon of lemon zest until smooth.

Add the berries

Scatter the 1 1/2 cups of fresh blueberries evenly over the warm, baked crust.

Add the filling

Pour the lemon filling over the blueberries, so it just covers them.

Bake again

Return the pan to the oven and bake for another 20 to 25 minutes, until the filling is set and no longer jiggles in the center.

Cool and cut

Let the bars cool completely to room temperature, then chill for an hour if you like. Lift them out using the parchment, cut into squares and dust with extra powdered sugar.

The Ingredients, One by One

Flour

1 1/2 cups total: 1 cup in the crust, 1/2 cup in the filling, where it helps the custard set.

Powdered sugar

It melts into the crust and gives a tender, shortbread-like texture.

Cold butter

Cold, cubed butter makes a flaky, tender crust.

Granulated sugar

It sweetens the filling and balances the lemon.

Eggs

Three eggs set the filling into a soft, creamy custard.

Fresh lemon juice and zest

You need about 3 to 4 lemons. The zest holds the oils, and gives the bars a stronger lemon flavor.

Fresh blueberries

Frozen berries work too. Don’t thaw them, to avoid bleeding.

The Technique Behind It

Why bake the crust first

A wet filling would make a raw crust soggy. Baking it first sets it into a crisp base.

Why pour the filling over the berries

The berries sit in the custard and stay juicy. Mixing them in gives streaky, purple bars.

Why cool completely

The filling sets as it cools. Cut warm, it is soft and messy.

Mistakes That Cost You the Dish

• Skipping the pre-bake The crust is soggy.
• Using bottled lemon juice The flavor is flat.
• Underbaking The filling is runny.
• Cutting too soon The bars fall apart.
• Overbaking The filling turns rubbery.

Fix It: If This Happens, Do This

Problem	Likely cause	Fix
Filling is runny	Underbaked	Bake 5 more minutes, and chill.
Crust is soggy	Crust not baked enough	Bake the crust until golden.
Bars crumble	Crust not pressed firmly	Press hard with the bottom of a measuring cup.
Top is too brown	Oven too hot	Tent with foil.
Berries sank	Filling too thin	This is normal, and still delicious.

What Each Ingredient Does (and What You Can Swap)

Ingredient	Its job	Swap, and what changes
Fresh blueberries	Fruit	Raspberries work.
Lemon juice	Tang	Lime juice works.
Cold butter	Crust	No substitute.
Powdered sugar	Crust sweetness	Granulated sugar works.
Lemon zest	Aroma	Orange zest works.

Plan Ahead

• Make ahead: Make a day ahead.
• Fridge: Up to 4 days.
• Serving: Dust with sugar just before serving.
• Freezer: Freezes for 2 months.

What to Serve With It

Serve chilled or at room temperature, with a cup of tea. A spoonful of whipped cream or a few extra berries on the side make a nice plate.

Questions People Ask

About the Author

Cressio Rinaldi

Cressio Rinaldi is the recipe developer behind Cressio Recipes. He cooks, tests, and writes every recipe on the site himself — refining each one until it's simple enough for a weeknight and good enough to make again. He's not a trained chef, just someone who cooks constantly and pays close attention to what actually makes a recipe work.