As far as I can remember, my mom only prepared sweet potatoes one way when I was growing up, and I don’t know exactly what that is, because I wouldn’t eat them. They were the only dish I was ever allowed to skip without even a no-thank-you helping. She served them twice a year, at Thanksgiving and then a month later when we repeated the Thanksgiving meal on Christmas. I don’t think anyone ate them except my mom and my brother-in-law.
I was in my twenties the first time I saw someone serve sweet potatoes any other way. They were simply roasted and served with salt and pepper. It was a revelation to me that sweet potatoes could be served without sugar and syrup and marshmallows. These days, I like sweet potatoes okay, but with dinner, I prefer to pair them with savory ingredients. Adding sugar to potatoes that are already sweet seems like serving dessert on the same plate as dinner.
No, if I decide to add sugar to sweet potatoes, it will be to make them into something that is unmistakeably dessert. With only 1 cup of mashed sweet potatoes in a 3-layer cake, this cake doesn’t taste overwhelmingly of sweet potatoes, but it is a pretty orange color, not to mention light and fluffy and moist, everything you want in a cake. If you’re going to add a bunch of sugar to your sweet potatoes, this is the way to do it.
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Sweet Potato Cake with Maple Cream Cheese Frosting (slightly adapted from Alisa Huntsman and Peter Wynne’s Sky High: Irresistible Triple Layer Cakes )
2 medium or 1 large sweet potato (12 ounces)
3 cups (12 ounces) cake flour
1 tablespoon baking powder
1½ teaspoons ground cinnamon
¾ teaspoon ground nutmeg
¼ teaspoon ground cloves
5 eggs, separated
2¼ cups (15.75 ounces) sugar
½ teaspoon table salt
10 tablespoons unsalted butter, at room temperature
1½ teaspoons vanilla extract
1¼ cups milk, room temperature
10 ounces cream cheese, room temperature
8 tablespoons (1 stick) butter, room temperature
3 cups (12 ounces) powdered sugar, sifted
3 tablespoons maple syrup
1. Heat the oven to 400 degrees. Prick each sweet potato with a fork in 5-6 places; place on a baking sheet and bake for 1 hour or until the potatoes are very soft. Remove from the oven and cool slightly. When the potatoes are cool, peel off the skin and remove any dark spots. Cut the potatoes into chunks and puree in a food processor until smooth. Measure out one cup of potato puree; discard the rest or save for another use.
2. Reduce the oven temperature to 350 degrees. Butter and flour the bottoms and sides of three 8- or 9-inch pans, or spray with baking spray. Line the bottom of the pans with parchment paper; grease the paper. In a small bowl, combine the flour, baking powder, cinnamon, nutmeg, and cloves; set aside.
3. In the bowl of electric mixer fitted with the whisk attachment, beat the egg whites on medium speed until frothy. Increase the speed to high and gradually add ¼ cup sugar. Continue to beat until the egg whites are moderately stiff. Transfer the egg whites to a separate bowl.
4. In the same bowl (no need to wash it), with the mixer fitted with the paddle attachment, combine the sweet potato, butter, vanilla, remaining sugar, and salt; beat on medium speed until light and fluffy, 3-4 minutes. Add the egg yolks one at a time, scraping the sides of the bowl after each egg yolk is added. Reduce the mixer speed to low and add one-third of the dry ingredients, followed by half the milk, another one-third of the dry ingredients, the remaining milk, and the remaining dry ingredients.
5. With a large spatula, fold in one-fourth of the egg whites into the batter to lighten it. Fold in the remaining egg whites until no streaks remain, making sure to not over mix. Divide the batter evenly between the prepared pans.
6. Bake for 25-35 minutes or until a toothpick inserted into the center of a cake layer comes out clean. Let the cake layers cool in the pan for 10 minutes, then turn out onto wire racks. Cool completely before frosting, at least 1 hour.
7. For the frosting: In a stand mixer fitted with the paddle attachment (or in a large bowl with a hand mixer), beat the cream cheese and butter on medium speed until smooth, about 1 minute. Stop the mixer, add the sugar, and mix on low speed until the sugar is incorporated; increase the mixer speed to medium and beat until light and smooth, 2-3 minutes. Mix in the maple syrup.
8. To assemble: Transfer one cake layer to a serving platter. Evenly spread ⅛-inch frosting over the top. Top with a second cake layer and another layer of frosting, then the third cake layer. If you have time, spread a very thin layer of frosting over the top and sides of the cake; chill, uncovered, for 30 minutes; this step will reduce crumbs in your final layer of frosting. Spread the remaining frosting evenly over the top and sides of the cake.