Combine 1/2 cup sugar and next 3 ingredients; beat at medium speed of an electric mixer 5 minutes or until well blended. Combine 1-1/2 cups flour and baking soda. With mixer running at low speed, add to egg mixture alternately with yogurt, beginning and ending with flour mixture. Pour batter into a 9-1/2-inch round tart pan coated with cooking spray. Spread butter evenly over bottom and up sides of pan. Combine remaining 1/4 cup sugar, remaining Tbsp flour, blueberries, cinnamon, and allspice, tossing gently. Spoon evenly over batter, leaving a 1/2-inch border. Bake at 350 deg for 45 minutes or until lightly browned; cool 20 minutes on a wire rack. Sprinkle with powdered sugar.