Preheat oven to 340 degrees.
In a medium bowl, sift together 1 1/2 cups flour, 1/2 cup sugar, 2 1/2 teaspoons baking powder, and 1/2 teaspoon salt.
In a measuring cup, whisk together 1/2 cups milk, 1 egg, 2 tablespoons canola oil, and 2 teaspoons vanilla. Add to dry ingredients, and mix well.
Spread the batter evenly into a greased spring form pan.
In a medium bowl combine 2 1/2 cups of flour, 1 cup packed brown sugar, and 2 teaspoons cinnamon.
Sprinkle over the cake batter.
Bake for 15 minutes. Rotate pan, and bake for another 10 minutes or until a cake tester comes out clean.
Cool for 10 minutes, and remove the sides of the pan.
When thoroughly cooled, sprinkle with confectioners' sugar.
(adapted from Martha Stewart) Pin It