Makes 20

• 2 quarts canola oil
• 2 cups all-purpose flour, plus more for pan, work surface, and cutter
• 1/4 cup sour cream
• 1 1/4 cups cake flour, (not self-rising)
• 3/4 cup sugar
• 1 1/2 cups baking powder
• 1/2 teaspoon baking soda
• 1 1/2 teaspoons salt
• 1 1/2 teaspoons freshly grated nutmeg
• 1 packet active dry yeast (1/4 ounce)
• 3/4 cup plus 2 tablespoons nonfat buttermilk
• 1 extra-large whole egg
• 2 extra-large egg yolks
• 1 teaspoon pure vanilla extract
• 1 12-ounce package semisweet chocolate chips
• 1 cup heavy cream
• 1/2 cup assorted sprinkles, for decorating (optional)