The recipe for this moist, delicious chocolate cake comes from Tammy Rao of Halifax, Nova Scotia.
Preheat oven to 350 degrees. Butter a 9-by-13-inch baking pan. Line bottom with wax or parchment paper; butter paper.
Whisk together dry ingredients in a mixing bowl. Add remaining ingredients; with an electric mixer, beat on low speed until moist. Raise speed to medium; beat until smooth, about 3 minutes more.
Pour into prepared pan; bake until a toothpick inserted in center comes out clean with a few moist crumbs, 25 to 30 minutes. Cool in pan 10 minutes; invert onto a wire rack. Remove paper; reinvert to cool completely. Dust with confectioners' sugar, if desired.