Easy 3-Ingredient Lemon Bars (Quick Cake Mix Dessert)
These 3-ingredient lemon bars are the kind of easy dessert that disappears fast at any gathering. Bright, sweet, and irresistibly tangy, they’re made with a simple shortcut—boxed cake mix and canned lemon pie filling—so you can whip them up with almost no effort.
This recipe is a classic potluck dessert favorite, especially popular in Midwestern kitchens where practical, crowd-pleasing dishes reign. The buttery cake mix creates a soft, crumbly crust and topping, while the lemon filling bakes into a glossy, vibrant layer that delivers bold citrus flavor in every bite.
Whether you’re heading to a family gathering, church supper, or need a last-minute dessert, these lemon bars are a reliable go-to.
Why You’ll Love These Lemon Bars
Only 3 ingredients
Super quick and beginner-friendly
Perfect for potlucks and parties
Bright lemon flavor with a buttery crust
Easy to transport and serve
Ingredients
1 box (15.25–16.5 oz) lemon cake mix
1/2 cup (1 stick) unsalted butter, melted
1 can (21 oz) lemon pie filling
How to Make 3-Ingredient Lemon Bars
Preheat oven to 350°F (175°C) and grease a 9×13-inch baking dish.
In a bowl, mix the dry cake mix with melted butter until crumbly.
Press 2/3 of the mixture into the bottom of the dish to form the crust.
Spread lemon pie filling evenly over the crust.
Sprinkle remaining crumb mixture over the top.
Bake for 25–30 minutes, until lightly golden and bubbling at the edges.
Cool completely, then refrigerate for 1–2 hours for cleaner slices.
Cut into squares and serve.
Serving Suggestions
These lemon bars are best served:
Chilled or at room temperature
Cut into small squares for easy grabbing
With coffee or black tea to balance sweetness
For a fuller dessert spread, pair them with:
Fresh berries or fruit salad
A light dusting of powdered sugar
A dollop of whipped cream for extra indulgence
Tips for Perfect Lemon Bars
Let bars cool completely before slicing for clean edges
Chill before serving for the best texture
Wipe your knife between cuts for neat squares
Bake slightly longer for firmer bars (great for buffets)
Variations
Use yellow or white cake mix for a milder flavor
Add fresh lemon juice or zest for extra tanginess
Mix in shredded coconut or chopped nuts for texture
Dust with powdered sugar for a bakery-style finish
Storage & Make-Ahead Tips
Refrigerator: Store up to 4 days in an airtight container
Freezer: Freeze for up to 2 months
Make ahead: Perfect to prepare the day before serving