Directions

1. In the bowl of a heavy-duty mixer, place flours, xanthan gum, salt, and egg replacer (if using). Blend with mixer on Low.
2. In a small bowl, dissolve sugar in water and add yeast.
3. Wait until the mixture foams slightly, then blend into the dry ingredients.
4. Add butter, egg whites, and vinegar. Beat on High for 3 minutes.
5. To form loaves, spoon dough onto greased and cornmeal dusted cookie sheets in two long French loaf shapes or spoon into special French bread pans.
6. Slash diagonally every few inches. If desired, brush with melted butter.
7. Cover the dough and let rise in a warm place until doubled in bulk, 20 to 25 minutes.
8. Preheat oven to 400 degrees F (200 degrees C). Bake for 40 to 45 minutes.
9. Remove from pan to cool.