Warm cinnamon and nutmeg, the faint sweetness of carrots, and a tender crumb under a thick layer of tangy frosting: carrot cake is one of the easiest layer cakes to bake well, because it is built on a forgiving technique. There is no creaming of butter and sugar, no mixer required for the batter, and no risk of a dry cake if the method is followed.
Two techniques do the work. The first is the oil batter, whisked by hand, which keeps the cake moist for days. The second is a cream cheese frosting that holds its shape between layers instead of sliding off the sides. Both are worth understanding, because they apply to many other cakes and frostings.
The Technique: Why an Oil Batter Stays Moist
Most butter cakes start by creaming soft butter with sugar, beating air into the fat to help the cake rise. Oil cakes work differently. Oil cannot hold air the way butter does, so the batter relies on baking powder and baking soda for lift, and on eggs whisked with sugar for some extra volume.
The payoff is texture. Butter is solid at room temperature, so a butter cake firms up as it cools and can feel dry the next day, especially after refrigeration. Oil stays liquid at room temperature and even in the refrigerator, so an oil-based cake feels moist and tender for longer. That matters for carrot cake, which is almost always stored in the refrigerator because of its cream cheese frosting.
Mixing the oil batter
- Whisk the eggs and both sugars by hand for about 1 minute, until slightly thickened and lighter in color. This dissolves some of the sugar and traps a little air.
- Pour in the oil in a slow stream while whisking, so it emulsifies into the eggs instead of floating on top. The batter should look smooth and glossy.
- Fold in the dry ingredients with a spatula just until no flour remains. Overmixing develops gluten and makes the cake tough.
- Fold in the grated carrots and nuts last.
Why the Carrots Matter
Carrots add sweetness, color and a great deal of moisture. As the cake bakes, the grated carrot softens and releases water into the crumb, which is a large part of why carrot cake is so moist.
Grate them on the small holes of a box grater or with the fine shredding disk of a food processor. Fine shreds melt into the cake. Coarse shreds stay as noticeable strands, and they release their water unevenly, which can leave wet pockets. Do not squeeze the grated carrots dry; the moisture is part of the recipe.
Pre-shredded carrots from a bag are cut thick and are often dry. They work in a pinch, but chop them finer first.
Spices and sweeteners
Cinnamon is the main spice, supported by a little nutmeg and ginger. Brown sugar adds a hint of molasses that suits the spices and keeps the cake soft, while white sugar gives a lighter crumb. Using both balances the two.
Cream Cheese Frosting That Holds Its Shape
Cream cheese frosting has a reputation for being soft and runny, and the cause is usually technique rather than the recipe. Cream cheese is a soft cheese with a fair amount of water held in a delicate structure. Beating it hard, especially when warm, breaks down that structure and releases the water, so the frosting turns loose and soupy.
The method that keeps it firm
- Beat the softened butter alone with the powdered sugar until smooth and fluffy, about 2 minutes. Butter gives the frosting its body.
- Add the cream cheese cold, straight from the refrigerator, cut into cubes.
- Beat on medium-low just until smooth, about 30 to 60 seconds, and stop.
- If it feels soft, chill it for 15 to 30 minutes before frosting.
Use full-fat cream cheese from a block. Spreadable cream cheese in tubs has extra water and stabilizers and will not firm up properly.
Applying Both Techniques to Moist Carrot Cake
Bake the batter in two 9-inch round pans, greased and lined with parchment circles. Divide it evenly, ideally by weighing each pan, so the layers bake at the same rate and stack level.
The cakes are done when they spring back when pressed lightly in the center and a toothpick comes out clean or with a few moist crumbs. Cool them in the pans for 15 minutes, then turn them out onto a rack and cool completely, at least 1 hour. Frosting a warm cake melts the frosting.
To assemble, place one layer top side down on a plate, spread about a third of the frosting over it, and set the second layer on top, also top side down, which gives a flat surface. Spread a thin crumb coat over the whole cake to trap loose crumbs, chill it 15 minutes, then cover with the rest of the frosting.
Fixing Common Problems
Domed layers
Cake layers dome when the edges set before the center has finished rising, pushing the middle upward. Lower oven racks, dark pans and ovens running hot all make it worse. Level a domed layer with a long serrated knife once it is fully cool, and save the trimmings for snacking. Fabric baking strips, soaked in water and wrapped around the pans, slow the edges and give flatter layers.
Dense, heavy cake
Usually the result of overmixing after the flour goes in, or of old baking powder or soda. Fold just until the flour disappears, and test the leaveners if the jars have been open for more than about 6 months.
Oily cake
If the oil was added all at once and not whisked in, it can separate in the batter and leave the baked cake greasy at the bottom. Stream it in slowly while whisking until the batter looks smooth and uniform.
Frosting sliding off the cake
The cake was still warm, or the frosting was too soft. Make sure both layers are completely cool, chill the frosting for 20 minutes, and chill the crumb-coated cake before the final layer of frosting.
Making a Sheet Cake Instead
For a simpler cake to serve a crowd, bake the batter in a greased and floured 9×13-inch pan for 35 to 40 minutes, until a toothpick in the center comes out clean. Cool it completely in the pan and spread the frosting over the top. There is no stacking or crumb coat, and the cake travels well with a lid or foil over the pan. Cut it into 15 or 24 squares, depending on the crowd.
Bake the Carrot Cake
Makes one two-layer 9-inch cake, 12 slices. Total time includes cooling and a short chill.
The recipe
Carrot Cake
A two-layer spiced carrot cake made with a hand-whisked oil batter and finely grated carrots, filled and frosted with a firm cream cheese frosting.
- Prep
- 40 min
- Cook
- 32 min
- Total
- 2 hr 45 min
- Serves
- 12
Ingredients
Cake
Frosting
Method
- Prepare. Heat the oven to 350°F (175°C). Grease two 9-inch round cake pans and line the bottoms with parchment.
- Dry ingredients. Whisk the flour, baking powder, baking soda, salt, cinnamon, nutmeg and ginger in a bowl.
- Oil batter. In a large bowl, whisk the eggs and both sugars by hand for 1 minute, until slightly thickened. Slowly stream in the oil while whisking until smooth and glossy, then whisk in the vanilla.
- Combine. Fold in the dry ingredients with a spatula just until no flour remains. Fold in the carrots and nuts.
- Bake. Divide evenly between the pans and bake 28 to 34 minutes, until the centers spring back and a toothpick comes out clean or with a few moist crumbs. Cool in the pans 15 minutes, then on a rack until completely cool, at least 1 hour.
- Frosting. Beat the butter, powdered sugar, vanilla and salt until fluffy, about 2 minutes. Add the cold cream cheese and beat on medium-low just until smooth, 30 to 60 seconds. Chill 15 to 30 minutes if soft.
- Assemble. Set one layer top side down, spread with a third of the frosting, top with the second layer top side down. Apply a thin crumb coat, chill 15 minutes, then frost with the rest.
Notes
- Refrigerate the frosted cake up to 5 days.
- Unfrosted layers freeze up to 3 months.
Oven temperatures are for conventional ovens; for convection, reduce by about 25°F (15°C).
Storing and Serving
Store the frosted cake covered in the refrigerator for up to 5 days. Cream cheese frosting should not sit at room temperature for more than 2 hours. Take slices out about 20 minutes before serving; the oil-based crumb stays soft even cold, but the frosting tastes creamier slightly warmed.
Unfrosted layers freeze well for up to 3 months, wrapped tightly in plastic and then foil. Thaw them in the wrapping at room temperature before frosting. A whole frosted cake can be frozen for up to 1 month: freeze it uncovered until firm, then wrap.