Grate the orange rind until you have about 1 tablespoon zest. Cut the orange in half and squeeze it. Mix 1/4 cup of the juice with the zest in a mixing bowl. Use the rest for another purpose.
Add the eggs, milk, cinnamon, nutmeg, sugar, and vanilla. Whisk together to dissolve the sugar.
Heat 2 tablespoons of the butter in a nonstick skillet over medium-high heat. Dip 2 slices of the bread into the egg-milk mixture, coating evenly. Fry in the butter until golden brown, 2 to 3 minutes on each side. Repeat until all the butter and bread is used.
Sprinkle with powdered sugar and serve hot.
Yield: 4 servings