1Heat oven to 350°F. Spray 8x4-inch loaf pan with cooking spray.
2In large bowl, mix flours, brown sugar, oats, the flaxseed, baking soda and salt. Stir in buttermilk just until mixed. Pour batter into pan. Sprinkle with 1 tablespoon oats.
3Bake 45 to 55 minutes or until toothpick inserted in center comes out clean. Cool in pan on cooling rack 5 minutes. Remove from pan to cooling rack. Cool completely, about 2 hours, before slicing.