1/2 cup butter, softened
1/2 cup white sugar
1 egg
2 cups all-purpose flour
2 1/2 teaspoons baking powder
1/4 teaspoon salt
3/4 cup nonfat plain yogurt
1 pint fresh strawberries
1 pint fresh raspberries
1/2 cup white sugar
1/2 cup all-purpose flour
3/4 teaspoon ground cinnamon
1/2 cup butter