Heat oven to 350. Spray 6 muffin cups w/ cooking spray. In bowl, combine flours, baking powder, baking soda, and salt. Cut in butter until crumbly.
In another bowl, stir together sour cream, 1/2 cup sugar, milk and egg. Add to dry ingredinets until just combined. In small bowl, stir together brown sugar,nuts, 2 tbsp sugar and cinnamon.
Spoon 1/2 the batter into cups, sprinkle w/ 1/2 the nut mix. Top w/ remaining batter and nut mix. Bake 25 min, or until a toothpick inserted in center comes out clean.
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