Preheat oven to 350F degrees.

Coat a 9-inch spring-form cake pan with coconut oil or cooking spray.

In a medium size bowl, beat butter and yogurt with a hand mixer until creamy.

Slowly add 1 c sugar, then add the egg.

In a large size bowl, combine flours and baking powder

Stir in butter mixture.  Add vanilla.  Then fold in blueberries.

Pour batter into pan.

Combine remaining 1/8 c sugar and cinnamon.  Sprinkle over batter.

Bake for 1 hour and allow cake to cool before serving.