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Freshly baked Three-Ingredient Lemon Bars cooling before serving.

Three-Ingredient Lemon Bars

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These Three-Ingredient Lemon Bars are bright, buttery, creamy, and incredibly easy to make. A soft lemon filling sits on top of a buttery cake mix crust for a refreshing dessert that’s perfect for spring, summer, Easter, Mother’s Day, baby showers, bake sales, or any occasion. While only three main ingredients are required, a few simple additions create a bakery-quality texture and flavor.

  • Total Time: 50 minutes
  • Yield: 50 Minutes (+2 Hours Chilling)

Ingredients

Scale

Main Ingredients

  • 1 box (15.25 oz / 432 g) yellow cake mix
  • 1 can (14 oz / 396 g) sweetened condensed milk
  • ½ cup (120 ml) freshly squeezed lemon juice

Recommended Ingredients

  • 6 tbsp (85 g) unsalted butter, melted
  • 1 tbsp finely grated fresh lemon zest
  • 1 tsp pure vanilla extract
  • ¼ tsp fine sea salt

Optional Garnishes

 

  • Powdered sugar
  • Fresh lemon zest
  • Thin lemon slices
  • Fresh raspberries
  • Fresh mint
  • Whipped cream

Instructions

1. Prepare the Pan

Preheat the oven to 350°F (175°C).

Line an 8×8-inch baking pan with parchment paper, leaving an overhang on two sides for easy removal.

Lightly grease the parchment.


2. Prepare the Crust

Reserve 1 cup of the cake mix.

Combine the remaining cake mix with the melted butter until coarse crumbs form.

Firmly press into the prepared pan.

Bake for 10 minutes.

Cool 5 minutes.


3. Prepare the Filling

Whisk together:

  • Sweetened condensed milk
  • Fresh lemon juice
  • Lemon zest
  • Vanilla
  • Salt

Whisk until smooth.


4. Assemble

Pour filling onto the warm crust.

Evenly sprinkle reserved cake mix over the top.

Do not press.


5. Bake

Bake 20–25 minutes.

The edges should be lightly golden.

The center should still jiggle slightly.


6. Cool

Cool completely.

Refrigerate at least 2 hours.

For best slices, chill overnight.


7. Serve

Lift from pan.

Slice using a warm knife.

Dust generously with powdered sugar.

Garnish with fresh zest.

Serve chilled.

Notes

✔ Fresh lemon juice is strongly recommended.

✔ Melted butter creates a sturdy crust.

✔ Lemon zest greatly improves flavor.

✔ Vanilla balances acidity.

✔ Salt enhances sweetness.

✔ Chill completely before slicing.

✔ Wipe the knife clean between every slice.

✔ Store refrigerated.

 

✔ Freeze up to 3 months.

  • Author: Elian Cove
  • Prep Time: 15 Minutes
  • Cook Time: 35 Minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian