Preheat the oven to 350 degrees F. In a large mixing bowl, cream the butter and both sugars together with an electric mixer. Beat in the eggs, one at a time, then mix in the orange juice, vanilla, and orange zest. Add the flour, baking powder, salt, orange zest, and vanilla and mix together well. Generously butter and flour a 10 inch bundt pan and scoop the batter into it, smoothing the top with a spatula. Bake for 30 to 35 minutes, or until the sides shrink away from the pan and the center of the loaf springs back. Cool the pan on a rack for 10 minutes, then turn out onto a round platter. Sprinkle a little confectioners sugar over the top of the bread and serve warm or at room temperature, accompanied by small pots of cranberry butter.
c.1997, M.S. Milliken & S. Feniger, all rights reserved