Three Ingredient Easy Lemon Bars Recipe

These super easy lemon bars only need 3 ingredients — lemon cake mix, lemon pie filling, and powdered sugar. No fresh lemons, no stand mixer, no fuss.

I am always trying to sharing the easiest of recipes with you. I get that constantly cooking and baking can be a LOT (unless you absolutely love being in the kitchen, then more power to you!

I have a soft spot for recipes that seem like they shouldn’t work but absolutely do. These 3 ingredient lemon bars are exactly that. Three ingredients, one bowl, one pan, and about 25 minutes from start to finish. The result is a chewy, bright, lemony bar that holds its own at a bake sale, a bridal shower, or just a random Tuesday when someone in the house needs something sweet.

This is also a fantastic recipe to make with kids. My kids love being the ones to dust the powdered sugar on top — always too generously, never apologetically. It’s the kind of baking session that doesn’t require much cleanup or stress, which is exactly what after-school baking should feel like.

What You Need (Just 3 Things)

Lemon Cake Mix (1 box) This is the base and the binder. The dry cake mix gives the bars their structure without needing eggs, butter, or flour — the leavening and flavor are already built in. Any brand works here. Don’t prepare the batter according to the box directions; you’re using the dry mix straight from the box and combining it directly with the pie filling.

Lemon Pie Filling (1 can, 21 oz) This is what makes these bars so easy and so good. Lemon pie filling — not lemon curd, not lemon pudding mix — is thick, sweet, intensely lemony, and acts as both the wet ingredient and the flavor punch. The 21 oz can is the standard size you’ll find at most grocery stores. Make sure you grab pie filling, not pie mix (the mix requires you to add water and cook it separately — that’s a different product).

Powdered Sugar Also called confectioners’ sugar. This goes on top after baking, not into the batter. It softens the tartness, adds a little sweetness to each bite, and makes the bars look finished and pretty without any extra effort. Don’t skip it and don’t be shy with it — a thin dusting won’t do the job. You want a proper snow.

How to Make Them

Preheat your oven to 350°F and lightly grease a 9×13 inch baking pan (or line it with parchment paper — this makes cleanup and removal much easier).

Open your box of dry lemon cake mix and pour it into a large mixing bowl. Add the entire can of lemon pie filling. Stir them together until fully combined. The mixture will be thick and a little sticky — that’s exactly right. Don’t add anything else. No water, no eggs, no oil. It’s going to look like it might not bake into something real, but trust it.

Spread the mixture evenly into your prepared pan. It’s thick, so use a spatula or the back of a spoon to push it into the corners and smooth the top. Even thickness matters here so the bars bake at the same rate throughout.

Bake for 12 to 15 minutes. The tops should look just set and slightly matte — not wet and shiny. If your oven runs hot, check at 12 minutes.

Here’s the part where first-timers sometimes panic: when you pull these out of the oven, the center will still look soft and not fully solid. That is completely normal. These bars firm up as they cool, and they need time to do that. Set the pan on a wire rack and let them cool completely before you cut or dust them — at least 30 minutes. I know it’s hard to wait. Do it anyway.

Once cooled, dust generously with powdered sugar and cut into squares.

Tips for the Best Lemon Bars

Don’t prepare the cake mix according to the box. Use the dry mix straight — no eggs, no oil, no water. This is the most common mistake on the first attempt.

Use a 9×13 pan. An 8×8 will make the bars too thick to bake through properly in this time. If you only have an 8×8, add about 5 minutes to the bake time and check the center carefully.

Line the pan with parchment paper. Not required, but it makes lifting the bars out for clean cutting so much easier. Leave a little overhang on the sides and you’ve got built-in handles.

Cool completely before cutting. Cutting into warm bars is a mess. Room temperature is the minimum — chilled is even better if you have the patience.

Don’t skimp on the powdered sugar. This isn’t decoration. It balances the tartness of the lemon filling and gives every bite that finished, bakery-style taste. Use a fine mesh sieve if you have one for the most even coverage.

Store in an airtight container with parchment paper between layers. Room temperature for up to 3 days, refrigerator for up to 5. They actually taste great cold.

Standout Tips

For bake sales or events: Cut them after they’re fully cooled and chilled, and they’ll hold their shape much better for transport. Pack in a single layer if possible.

For even cleaner cuts: Wipe your knife with a damp paper towel between each slice. The filling can stick to the blade and drag if you don’t.

Want to dress them up? Add a little lemon zest on top along with the powdered sugar for an extra pop of color and flavor. It makes a simple bar look significantly more intentional without adding any real work.

Make it a double batch: This recipe doubles easily. Use two 9×13 pans and rotate them halfway through baking.

Make sure you have a prepared 9×13 pan ready for your perfect lemon bars. These may not be traditional lemon bars but the end results are just as good.These homemade lemon bars are great for bridal showers or even baby showers!

If you have little time and you are looking for an easy lemon bars recipe with confectioner’s sugar, grab these three ingredients at the grocery store and whip these up!

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