3-Ingredient Lemon Cake
Prep Time: 10 minutes
Cook Time: 30–40 minutes
Cooling Time: 30 minutes
Servings: 12
Baking Pan: 9 × 13-inch pan
This 3-Ingredient Lemon Cake is soft, moist, and full of bright lemon flavor. Made with boxed lemon cake mix, lemon pie filling, and eggs, it delivers a delicious homemade-style dessert with very little preparation. There is no need to measure flour, cream butter, or prepare a separate lemon filling.
The cake mix provides the dry ingredients, while the lemon pie filling adds moisture, sweetness, and citrus flavor. Eggs help bind everything together and give the cake structure. The finished cake has a tender, slightly dense crumb that tastes lovely on its own.
It is an easy option for family gatherings, casual celebrations, potlucks, or an afternoon treat. With one mixing bowl and three simple ingredients, you can have the batter ready before the oven finishes heating.
Ingredients 3-Ingredient Lemon Cake
1 box lemon cake mix, approximately 15.25 ounces
1 can lemon pie filling, approximately 21 ounces
3 large eggs
Important: Use the cake mix dry. Do not add the water, oil, or additional eggs listed on the package. This recipe replaces those package additions with lemon pie filling and the three eggs listed above.
Ingredient Notes
Lemon cake mix: A standard lemon cake mix provides the strongest lemon flavor without requiring extra ingredients. Box sizes vary, so choose one close to 15.25 ounces. A substantially smaller or larger box may change the consistency and baking time.
Lemon pie filling: Use a prepared filling intended for lemon pies. It should be thick, smooth, and ready to use. Lemon pudding, lemon juice, and lemon curd are different products and should not be substituted directly in this recipe.
Eggs: Large eggs provide structure and help the cake rise. For easier mixing, remove them from the refrigerator about 20–30 minutes before preparing the batter. Cold eggs will still work if you need to start immediately.
Instructions
Step 1: Preheat the oven.
Preheat your oven to 350°F (175°C). Position a rack in the center so the cake receives even heat. Allow the oven to finish preheating before placing the batter inside. Starting with a properly heated oven helps the cake rise and bake more consistently.
Step 2: Prepare the baking pan.
Line a 9 × 13-inch baking pan with parchment paper, covering the bottom and extending it up two opposite sides. This makes removing the cooled cake easier. A light-colored metal pan is ideal because it generally browns the edges less aggressively than a dark pan.
Step 3: Combine the eggs and filling.
Crack the eggs into a large mixing bowl and whisk until the yolks and whites are combined. Add the lemon pie filling and stir until the mixture looks mostly smooth. Scrape the bottom and sides of the bowl so no streaks of egg remain.
Step 4: Add the cake mix.
Add the dry lemon cake mix to the bowl. Stir gently with a sturdy spatula or use an electric mixer on low speed until the dry ingredients are incorporated. Scrape around the bowl as needed. The batter will be thicker than some traditional cake batters.
Step 5: Avoid overmixing.
Stop mixing once there are no visible pockets of dry cake mix. A few small lumps are fine. Beating the batter excessively can produce a tighter, less tender crumb. You only need a uniform mixture, not a perfectly glossy or completely lump-free batter.
Step 6: Fill the pan.
Transfer the batter to the prepared pan. Use a spatula to spread it evenly into the corners and level the surface. Because the batter is fairly thick, it may not spread evenly by itself. An even layer helps prevent thin edges from overbaking before the center is ready.
Step 7: Bake the cake.
Bake for 30–40 minutes, checking at the earlier end of the range. The surface should look set, and the edges should be lightly golden. Insert a toothpick into the center: it should come out clean or with a few moist crumbs, without wet batter.
Step 8: Cool before slicing.
Place the pan on a heatproof rack and let the cake cool for at least 30 minutes. It will be delicate while hot, so avoid cutting immediately. For neater squares, allow it to cool completely, then slice with a clean knife, wiping the blade between cuts.
Tips for the Best Lemon Cake
Check the package size. Cake mix boxes are not all the same weight. Using the amount specified helps keep the ratio of dry ingredients to filling balanced.
Use the correct filling. Lemon pie filling supplies both moisture and thickness. Plain lemon juice would make the batter behave very differently.
Measure doneness by texture. Baking times vary with ovens and pans. Look for a set center and check with a toothpick.
Keep the oven closed initially. Avoid opening the door during the first 25 minutes so the cake has time to rise and set.
Do not overbake. Remove the cake once the center is cooked. Extra time can dry out the edges.
Let it cool uncovered. Covering a warm cake traps condensation, which can make the surface sticky.
Storage
Once completely cooled, keep the cake in an airtight container at room temperature for up to two days in a cool kitchen. In warm conditions, refrigerate it instead.
For longer storage, refrigerate the covered cake for up to four days. Let individual slices stand briefly at room temperature before serving if you prefer a softer texture.
To freeze, wrap cooled slices individually and place them in a freezer-safe container. Freeze for up to two months for the best quality. Thaw the wrapped slices in the refrigerator overnight.
Serving Ideas
Serve this cake plain to keep the recipe at exactly three ingredients. Its lemon flavor and moist texture make it enjoyable without frosting.
For an optional presentation upgrade, add fresh berries, a little whipped cream, or a dusting of powdered sugar. These extras are not included in the three-ingredient recipe or the nutrition estimate.
Cut smaller squares for a dessert platter, or serve larger slices with tea or coffee. Chilled slices have a firmer texture, while room-temperature slices feel softer.
Estimated Nutritional Information
Per serving, based on 12 servings:
Calories: Approximately 220–260
Protein: Approximately 3 grams
Carbohydrates: Approximately 45–55 grams
Fat: Approximately 3–5 grams
Fiber: Usually less than 1 gram
Values depend on the cake mix and pie filling used. For a closer estimate, add the nutritional totals from both packages and the eggs, then divide by 12.
Nutrition Notes
This is a sweet dessert made with prepared cake mix and pie filling. Eggs contribute a small amount of protein, but the cake is not a high-protein or low-sugar recipe. Its main advantages are convenience, simple preparation, and easy portioning.
Questions and Answers
Can I use white or yellow cake mix?
Yes, a similarly sized box should work, but the lemon flavor will be milder because it comes mainly from the filling.
Can I replace the pie filling with lemon curd?
It is not a direct substitute. Lemon curd contains different proportions of sugar, fat, and eggs, which can affect how the cake sets.
Why is my cake dense?
This recipe naturally produces a moist, slightly dense cake. Excessive mixing, an incorrect box size, or underbaking can make it heavier.
Does it need frosting?
No. The cake is sweet and flavorful enough to serve plain, which also keeps preparation simple.
Can I make it ahead?
Yes. Bake it the day before serving, cool completely, and cover tightly. Add any optional toppings shortly before serving.
