Heat oven to 450°F. Place a sheet of parchment paper on a cookie sheet.
In medium bowl, stir together flour blend, baking soda, baking powder, salt and xanthan gum. Stir in raisins; set aside.
In the bowl of a stand mixer, beat sugar, butter or coconut oil and egg on medium speed about 2 minutes or until light and fluffy. Gradually stir in milk, vinegar, and flour mixture.
Place dough on cookie sheet and pat into circle about 1 1/2 inches thick. With sharp knife, cut X across loaf about 1/2 inch deep.
Bake at 450°F 5 minutes; reduce heat to 350°F, and bake 25 minutes longer or until golden brown and bottom sounds hollow when tapped.
Remove from pan to cooling rack. Cool completely before slicing.