1Heat oven to 350°F. Generously spray bottom and sides of 9x5-inch loaf pan with cooking spray (without flour).
2In small bowl, mix all flours, the xanthan gum, guar gum, baking powder, baking soda, cinnamon and salt; set aside. In medium bowl, beat remaining ingredients with whisk until blended. Add flour mixture; stir until thoroughly mixed. Pour into pan.
3Bake 30 minutes. Cover with foil; bake 25 to 30 minutes longer or until toothpick inserted in center comes out almost clean. Cool 5 minutes; remove from pan to cooling rack. Cool completely, about 1 hour. Wrap tightly; store in refrigerator.