These 3-Ingredient Lemon Bars combine convenience with a bold citrus punch. Made with dry yellow cake mix, melted butter, and ready-to-use lemon curd or fruit filling, this budget-friendly dessert features a buttery crust, a bright lemon filling, and a rustic golden crumb topping.
Ingredients & Equipment
Component Breakdown
| Section | Ingredient | Quantity | Functional & Culinary Role |
| Structural Base & Topping | Yellow cake mix | 1 box (15.25 oz / 432g) | Dry starch, flour, and sugar matrix; forms the crust and crumb. |
| Unsalted butter | ½ cup (115g / 1 stick), melted | Binds dry cake mix into a pressable, buttery shortbread-style crumb. | |
| Tangy Citrus Core | Lemon filling or lemon curd | 1 jar/can (20 oz / 567g) | Smooth, sweet-tart citrus layer that sets when baked and chilled. |
🧪 Food Science: Starch-Fat Binding & Cold Pectin Setting
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Starch-Fat Matrix Formation: Mixing dry cake mix directly with melted butter hydrates the flour proteins (gliadin and glutenin) with fat rather than water. This limits gluten development, resulting in a tender, crumbly shortbread crust rather than a chewy or bread-like structure.
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Firming via Thermal & Cold Gelation: Pre-made lemon fruit filling or curd relies on modified starch or pectin for structure. Baking at $350^\circ\text{F}$ ($175^\circ\text{C}$) softens the gel so it adheres to the crust, while subsequent refrigeration sets the hydrocolloid network firm, allowing clean, structural slicing.
Step-by-Step Instructions:
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