3 ingredient lemon bars

Prep Time: 5 minutes
Cook Time: 22 minutes
Total Time: 27 minutes (plus 1 hour chilling)
Intensity Level: 🍋 Low (Beginner-friendly, no mixer required)
Yield: 9 bars (8×8 pan) or 16 bars (9×9 pan)

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Why You’ll Love This Recipe

These 3-ingredient lemon bars are almost too good to be true. No complicated crust, no curd from scratch, no egg tempering. Just three simple ingredients transform into a bright, creamy, sweet-tart dessert with a naturally formed “crust” layer during baking. They are gluten-free, dairy-free, and require zero special equipment—just a bowl, a spatula, and a pan.

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Intensity Breakdown

Overall Verdict: Relaxed baking. Perfect for a rainy afternoon, a last-minute potluck contribution, or baking with kids.

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Ingredients

(Exact measurements are critical here—this recipe works because of precise ratios.)

• 1 cup (240ml) fresh lemon juice (about 4–5 large lemons)

• 1 can (14 oz / 397g) sweetened condensed milk

• 3 large eggs

That’s it. No flour. No butter. No sugar. No vanilla.

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Equipment Needed

• 8×8 or 9×9 square baking pan

• Parchment paper (or non-stick spray)

• Medium mixing bowl

• Whisk or fork

• Measuring cup (for lemon juice)

• Lemon juicer (helpful but not required)

• Cooling rack

• Sharp knife (for cutting)

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Instructions

1. Preheat & Prepare Pan (Intensity: Low)

Preheat your oven to 350°F (175°C). Line an 8×8 baking pan with parchment paper, leaving an overhang on two sides (this creates “handles” for lifting the bars out later). If using a 9×9 pan, bars will be slightly thinner; adjust cooling time slightly down (20 min bake).

2. Juice the Lemons (Intensity: Medium-Low)

Roll each lemon firmly on the counter before cutting to release more juice. Cut and juice until you have exactly 1 cup. Strain out seeds and pulp if desired (pulp is fine for texture; seeds are not).

3. Mix the Batter (Intensity: Very Low)

In a medium bowl, pour the entire can of sweetened condensed milk. Add the 3 eggs. Whisk until completely smooth and pale yellow—about 30 seconds. Slowly pour in the lemon juice while whisking continuously. You will see the mixture begin to thicken slightly (this is the acid from the lemon “cooking” the egg and milk protein—totally normal).

4. Pour & Bake (Intensity: None)

Pour the batter into the prepared pan. It will be thin—that’s correct. Bake for 20–22 minutes on the center rack. The edges will be set and lightly golden, but the center will still jiggle slightly when you shake the pan (like a firm pudding, not liquid).

5. Cool Completely (Intensity: Patience)

Remove pan from oven and place on a cooling rack. Cool at room temperature for 30 minutes. Then transfer to the refrigerator and chill for at least 1 hour (2 hours is better). Do not skip chilling—this is when the bars set into sliceable squares.

6. Cut & Serve (Intensity: Low)

Lift the bars out using the parchment handles. Run a sharp knife under hot water, wipe dry, then cut clean squares (9 large or 16 small). Wipe the knife between cuts for neat edges. Dust with powdered sugar if you want to be fancy (not counted in 3 ingredients).

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How This Works (The Science)

Normally, lemon bars require a buttery shortbread crust and a lemon curd thickened with cornstarch or extra yolks. Here, sweetened condensed milk provides sweetness, creaminess, and structure. The eggs act as the binder. Lemon juice provides acidity, which thickens the milk proteins naturally—similar to how lemon juice makes milk “clabber.” Baking solidifies it into a custard-like bar with a soft, tender top and a slightly denser bottom that mimics a crust.

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Storage & Make-Ahead

• Refrigerator: Store in an airtight container for up to 5 days. They actually improve after day two as flavors meld.

• Freezer: Wrap individual bars in plastic wrap, then foil. Freeze for up to 2 months. Thaw overnight in the fridge before serving.

• Make-ahead: Perfect to bake the night before an event. Chill overnight, cut the next morning.

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Troubleshooting

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Nutrition Information

Per serving (1 bar, based on 9 bars per 8×8 pan)