Preheat oven to 375°.
Lightly spoon flours into dry measuring cups; level with a knife. Combine flours and the next 4 ingredients (flours through salt) in a medium bowl; make a well in center of mixture. Combine buttermilk, sugar, margarine, almond extract, and egg whites; stir well with a whisk. Add to flour mixture, stirring just until moist.
Spoon the batter into 12 muffin cups coated with cooking spray; sprinkle with nuts. Bake at 375° for 20 minutes or until muffins spring back when touched lightly in center. Remove from pans immediately.