These vegan lemon bars have a shortbread crust and a firm, sliceable lemon filling made without eggs or dairy. Cornstarch and plant milk do the thickening work, and a small amount of turmeric gives the filling its yellow color. If you want a crowd-friendly dessert that travels well and comes together in one baking pan, this is a reliable choice.
Why this recipe works
Two things make this recipe succeed. First, the cornstarch-to-liquid ratio is calibrated so the filling sets firm enough to cut cleanly — too little cornstarch and you get a runny layer that slides off the crust. Second, the vegan butter is stirred into the filling after cooking, not before. Adding fat at the end coats the starch granules and produces a smooth, slightly glossy texture instead of a gummy one. Get those two steps right and the bars will hold their shape at room temperature long enough to serve.
What can go wrong
- Filling doesn’t set: This almost always means the filling wasn’t cooked long enough on the stovetop before going into the oven. It should be noticeably thickened — like a loose pudding — before you pour it over the crust. If it’s still watery, keep stirring over medium heat.
- Crust shrinks or puffs unevenly: The crust needs to be pressed firmly and evenly into the pan. Loose or uneven pressing causes it to pull away from the edges or bubble up in the center during blind baking. Use the flat bottom of a measuring cup to press it down.
- Bars crack when sliced: Cutting before the bars are fully chilled is the usual culprit. Let them cool completely at room temperature first, then refrigerate for at least two hours. Use a sharp knife and wipe the blade clean between cuts.
- Filling tastes flat: Bottled lemon juice won’t give you the same brightness as fresh. If the filling tastes muted after baking, the lemon juice was likely the issue — fresh juice and fresh zest together make a real difference here.
- Powdered sugar dissolves before serving: If you dust the bars while they’re still warm or if they’re refrigerated after dusting, the sugar absorbs into the filling. Dust right before serving, not before.
About the ingredients
- Vegan butter: Use a stick-style vegan butter (Earth Balance Buttery Sticks or Miyoko’s European Style work well) rather than a soft spread from a tub. Tub spreads have higher water content and will make both the crust and filling greasier.
- Plant milk: Oat and soy milk are the most neutral options and give the filling the cleanest lemon flavor. Almond milk works but is thinner, so the filling may need an extra minute on the stove. Avoid canned coconut milk — the fat content throws off the texture.
- Turmeric: A pinch — no more than ⅛ teaspoon — is enough for color. More than that and you’ll taste it. Skip the garnish of lemon zest curls or edible flowers; it’s not worth the extra prep and cutting board.
- Cornstarch: Standard cornstarch from any grocery store works fine. Arrowroot powder can substitute in equal amounts if needed, though the set is slightly softer.
Storage and reheating
Store cut bars in an airtight container in the refrigerator for up to five days. Place parchment between layers so they don’t stick together. For longer storage, freeze the bars on a parchment-lined tray until solid, then transfer to a freezer-safe container with parchment between layers — they keep well for up to two months. Thaw overnight in the refrigerator. These bars are meant to be served cold or at room temperature; there’s no need to reheat them, and warming them will soften the filling too much to slice cleanly.
Vegan Lemon Bars
Equipment
- 8x8-inch baking pan
- Mixing bowls
- Saucepan
- Whisk
- Silicone spatula
- Plastic wrap or foil
Ingredients
For the Crust:
- 1 ¼ cups all-purpose flour preferably unbleached organic
- ½ cup vegan butter cold and cubed, such as Miyoko's or Earth Balance
- ¼ cup organic cane sugar or coconut sugar for a deeper flavor
- ¼ teaspoon sea salt
- 1 tablespoon cold water as needed to bind the dough
For the Lemon Filling:
- 1 cup fresh lemon juice from about 5–6 lemons, strained
- 1 tablespoon lemon zest finely grated from organic lemons
- 1 cup organic cane sugar or maple sugar for a milder sweetness
- ¼ cup cornstarch or arrowroot for a cleaner finish
- ¼ teaspoon ground turmeric for natural color (optional)
- â…› teaspoon sea salt
- ½ cup unsweetened plant milk such as almond or oat
- 2 tablespoons vegan butter for a smooth finish
For Garnish:
- 1 tablespoon powdered sugar for dusting
Instructions
- Preheat oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper, leaving overhang on two opposite sides for easy lifting later.
- Prepare the crust in a medium bowl, combine the flour, sugar, and salt. Add cold vegan butter and use a pastry cutter or your fingers to cut the butter into the dry ingredients. Mix until it resembles coarse crumbs. Add cold water, 1 teaspoon at a time, just until the dough holds together when pressed.
- Press the dough evenly into the lined pan. Use the bottom of a cup or your fingers to compact it. Bake for 20–22 minutes until lightly golden at the edges. Let cool slightly while preparing the filling.
- In a saucepan off heat, whisk together lemon juice, zest, sugar, cornstarch, sea salt, turmeric, and plant milk until fully dissolved and smooth.
- Cook over medium heat, whisking constantly until it thickens into a glossy, pudding-like consistency—about 5–7 minutes. Remove from heat and whisk in the vegan butter until smooth.
- Pour the filling over the baked crust and smooth the top with a spatula. Tap the pan gently to release any air bubbles.
- Bake for another 25 minutes at 325°F (165°C), or until the filling just begins to set around the edges but still trembles slightly in the center. It will firm fully as it cools.
- Cool at room temperature for 1 hour, then refrigerate for at least 3 hours or overnight until fully set.
- Lift the bars from the pan using the parchment overhang. Slice into 9 squares and dust with powdered sugar before serving. For clean edges, wipe the knife between cuts.
Notes
- For a gluten-free version, replace all-purpose flour with a 1:1 gluten-free blend that contains xanthan gum.
- Turmeric is optional and used only for color—adjust the amount for a deeper yellow or omit entirely for a paler look.
- Make sure to whisk constantly while cooking the filling to prevent lumps.
Nutrition
Your questions, answered
Can I make these lemon bars the day before I need them?
Yes — they’re actually better the next day. The filling firms up more fully overnight in the refrigerator, which makes slicing cleaner. Just hold off on dusting with powdered sugar until right before serving.
Can I use a gluten-free flour blend for the crust?
A 1:1 gluten-free baking flour (like Bob’s Red Mill or King Arthur’s measure-for-measure blend) works as a direct substitute for all-purpose flour in the crust. The texture will be slightly more crumbly, so press the crust firmly and give it a full chill before adding the filling.
How do I know when the filling is done baking?
The edges should look set and the center should have only a slight jiggle — similar to a just-set gelatin. It will continue to firm up as it cools, so don’t overbake waiting for a completely still surface or the filling will become rubbery.
My filling has lumps in it — what happened?
Lumps usually mean the cornstarch wasn’t fully dissolved before heating, or the mixture got too hot too fast and the starch clumped. Whisk the cornstarch thoroughly into the cold plant milk before adding any heat, and keep the temperature at medium rather than high throughout cooking.
More plant-based recipes to try
- Vegan Pavlova Perfection
- Vegan Eton Mess Delight
- Vegan Sticky Toffee Pudding
- Vegan ANZAC Biscuits Recipe