This carrot sheet cake is a moist, spiced cake baked in a single 15×10 pan and finished with a lemony cream cheese frosting and a handful of walnuts. It feeds a crowd without any layers, and it comes together with one whisk and one mixer.
The batter uses oil instead of butter, which keeps the crumb soft for days, and three cups of shredded carrots add moisture and a gentle natural sweetness. Frosting one flat cake is quick, so it is easy to bring to a potluck, a birthday, or a weekend dessert table.
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Why This Carrot Sheet Cake Recipe Works
Oil keeps this cake tender. Unlike butter, which firms up in the refrigerator, vegetable oil stays liquid when cold, so every square tastes soft even after a night in the fridge. The oil also coats the flour, which limits gluten and gives you a fine, even crumb.
The carrots do real work here. Three cups of finely shredded carrot release moisture as the cake bakes, and the small shreds melt into the crumb instead of leaving long strands. Cinnamon and nutmeg add warmth, while a little baking powder next to the baking soda gives a steady rise in the thin pan.
A flat pan means more frosting in every bite. The ratio of cream cheese topping to cake is higher than in a tall layer cake, and the lemon zest cuts through the sweetness so the frosting never tastes heavy. Because there is no stacking or leveling, even a first time baker gets neat results.
Ingredients for Carrot Sheet Cake
- 4 large eggs, at room temperature
- 1 cup vegetable oil
- 2 cups granulated sugar
- 2 cups all purpose flour
- 2 teaspoons baking soda
- 1/4 teaspoon baking powder
- 2 teaspoons ground cinnamon
- 1/2 teaspoon kosher salt
- 1/4 teaspoon ground nutmeg
- 3 cups finely shredded carrots
- 2/3 cup chopped walnuts
- 1 stick (1/2 cup) unsalted butter, softened
- 8 ounces cream cheese, softened
- 1 teaspoon pure vanilla extract
- 1/2 teaspoon lemon zest
- 4 cups powdered sugar
- Extra chopped walnuts and coconut flakes for garnish
Eggs. Room temperature eggs blend into the oil and sugar faster and trap more air, which helps the cake rise evenly. If you forget to set them out, place whole eggs in warm tap water for five minutes.
Carrots. Shred them on the small holes of a box grater so the pieces disappear into the crumb. Pack the measuring cup lightly rather than pressing the shreds down.
Flour and leaveners. Spoon the flour into the cup and level it off so the batter does not turn dense. Check that your baking soda and baking powder are fresh, since old leaveners give a flat cake.
Walnuts. Toast the walnuts in a dry skillet for four minutes if you want a deeper flavor, then cool them before folding them in. Pecans work as a swap, and the cake is just as good without nuts.
Cream cheese and butter. Use block cream cheese rather than the spreadable tub kind, because the block holds its shape and gives a thick frosting. Both the butter and the cream cheese should be soft but still cool to the touch.
How to Make Carrot Sheet Cake
1. Heat the oven and prep the pan Heat the oven to 350 degrees F. Grease a 15x10x1 inch rimmed pan with butter, dust it with flour, and tap out the extra so the cake releases cleanly.
2. Beat the wet ingredients Add the eggs, oil, and granulated sugar to a mixer bowl and beat on medium speed for 2 minutes, until the mixture looks smooth and slightly pale.
3. Whisk the dry ingredients In a separate bowl, whisk the flour, baking soda, baking powder, cinnamon, salt, and nutmeg until no streaks of spice remain.
4. Combine and fold Add the flour mixture to the egg mixture and beat on low just until the batter is smooth. Remove the bowl from the mixer and stir in the carrots and walnuts by hand.
5. Fill the pan and bake Pour the batter into the pan, spread it into the corners, and tap the pan on the counter to release air bubbles. Bake for 30 to 35 minutes, until a toothpick in the center comes out clean and the top springs back.
6. Cool completely Set the pan on a wire rack and let the cake cool for at least 1 hour. Frosting a warm cake melts the topping into a greasy layer, so patience pays off here.
7. Make the frosting Beat the butter and cream cheese with the vanilla until smooth, about 2 minutes. Add the lemon zest, then beat in the powdered sugar one cup at a time until the frosting is fluffy.
8. Frost and finish Spread the frosting over the cooled cake in an even layer, sprinkle with walnuts and coconut flakes, and cut into 20 squares.
How to Serve Carrot Sheet Cake
Cut the cake into squares and serve at room temperature, which brings out the spices. It pairs well with a cup of coffee or tea. For a bakery style spread, set it beside a cinnamon streusel coffee cake and a moist vanilla cake so guests can pick a flavor, and add a bowl of chocolate buttercream for anyone who wants extra topping. A cold berry kefir smoothie makes a light drink beside a thick square.
How to Store and Reheat Carrot Sheet Cake
Cover the frosted cake tightly and keep it in the refrigerator for up to 4 days, because the cream cheese frosting needs to stay cold. Let squares sit out for 20 minutes before serving so the crumb softens. To freeze, wrap the unfrosted cake in plastic and foil for up to 2 months, thaw it overnight in the refrigerator, and frost it fresh. There is no need to reheat, but a square warmed for 10 seconds in the microwave tastes like it just came out of the oven.
Tips and Variations for Carrot Sheet Cake
Measure the oil. Use a liquid measuring cup set on the counter and read it at eye level, since extra oil makes the center greasy.
Do not overbeat. Once the flour goes in, mix only until the streaks disappear. Overmixing builds gluten and gives a rubbery texture.
Check at 30 minutes. Ovens vary, so test early with a toothpick. Pull the cake as soon as the pick comes out clean.
Rotate the pan. Turn the pan halfway through baking if your oven has hot spots so the cake browns evenly.
Swap the nuts. Pecans or raisins can replace the walnuts, and you can leave them out completely for a nut free version.
Add more zest. Increase the lemon zest to 1 teaspoon if you like a brighter frosting, and add it with the vanilla.
Skip raw batter. This batter contains raw eggs, so do not taste it before it bakes.
Keep it cold. Cream cheese frosting is a dairy topping, so do not leave frosted squares out for more than 2 hours, and read the University of Wisconsin Extension leftovers guidance when you pack up what is left.
Frequently Asked Questions About Carrot Sheet Cake
How long does carrot sheet cake stay fresh?
The cake keeps for 4 days in the refrigerator when covered, and the oil in the batter keeps the crumb soft the whole time.
Can I make carrot sheet cake ahead of time?
Yes. Bake the cake a day early, cool it, wrap it, and frost it on the day you plan to serve. You can also freeze the unfrosted cake for up to 2 months.
What pan size works for carrot sheet cake?
A 15x10x1 inch rimmed pan is the right size. A 9×13 pan also works, but the cake bakes thicker, so bake it longer and test with a toothpick.
Can I use butter instead of oil?
Melted butter works, but the cake will firm up in the refrigerator and taste a little drier, so oil is the better choice for a cake that is stored cold.
Do I have to use fresh carrots?
Yes, shred fresh carrots yourself. Pre shredded bagged carrots are drier and cut in longer strands, so they leave texture in the crumb.
Carrot Sheet Cake with Cream Cheese Frosting
Equipment
- 15x10x1 inch rimmed baking pan
- Electric mixer
- Box grater
- Wire rack
Ingredients
Main Ingredients
- 4 large eggs at room temperature
- 1 cup vegetable oil
- 2 cup granulated sugar
- 2 cup all purpose flour spooned and leveled
- 2 tsp baking soda
- ¼ tsp baking powder
- 2 tsp ground cinnamon
- ½ tsp kosher salt
- ¼ tsp ground nutmeg
- 3 cup finely shredded carrots lightly packed
- ⅔ cup chopped walnuts optional
- ½ cup unsalted butter softened, 1 stick
- 8 oz cream cheese softened, block style
- 1 tsp pure vanilla extract
- ½ tsp lemon zest
- 4 cup powdered sugar added 1 cup at a time
- ¼ cup extra chopped walnuts for garnish
- ¼ cup coconut flakes optional garnish
Instructions
Cooking
- Prep. Heat the oven to 350 degrees F, grease a 15x10x1 inch pan with butter, and dust it with flour. Beat the eggs, oil, and sugar for 2 minutes until smooth and pale.
- Mix the batter. Whisk the flour, baking soda, baking powder, cinnamon, salt, and nutmeg. Beat the dry mix into the egg mixture on low until just smooth, then fold in the carrots and walnuts by hand.
- Bake. Spread the batter into the pan and bake 30 to 35 minutes, until a toothpick in the center comes out clean and the top springs back. Cool on a rack for at least 1 hour.
- Whip the frosting. Beat the butter, cream cheese, and vanilla for 2 minutes until smooth. Add the lemon zest and powdered sugar, 1 cup at a time, until fluffy.
- Frost and serve. Spread the frosting over the fully cooled cake, top with walnuts and coconut, and cut into 20 squares. Keep chilled until serving.
