2 cans (16 oz each) pear slices, in juice or extra light syrup
1/2 cup plus 2 Tbsp sugar, divided
2 Tbsp cornstarch
1 Tbsp lemon juice
1 package (12 oz) frozen whole boysenberries or blackberries
2 cups all-purpose flour
1 Tbsp baking powder
1-1/4 cups low-fat 2% milk
1/4 cup melted butter