Preheat oven to 375 degrees. Spray muffin tin with nonstick spray.
In a large bowl, mix together flours, sugar, baking soda, baking powder and salt.
With a pastry blender, blend butter into dry mixture until it resembles coarse crumbs.
In another bowl, mix together buttermilk and eggs until blended.
Combine buttermilk mixture and dry ingredients and stir to combine.
Spoon batter into muffin cups.
Bake approximately 18-22 minutes or until tester in center comes out clean. Do not over bake.
Remove from oven and allow to cool 5 minutes before removing from tins.
