1. In a bowl, sift the flour, baking powder, and salt. Set aside.2. Cut the orange into pieces and blend it in a food processor until the peel is finely ground. 3. Add the egg, brown sugar, milk, vanilla, and oil and mix again. 4. Pour the liquid mixture over the dry ingredients, stirring as little as possible, just enough to obtain a moist dough. 5. Pour into a greased loaf pan and bake at 400°F for about 20-30 minutes or until a wooden stick comes out dry.