3 1/2 cups halved strawberries, divided
1/3 cup sugar
1/3 cup orange juice
2 teaspoons vanilla extract
1 teaspoon lemon juice
1 1/4 cups all-purpose flour
3 tablespoons sugar
1 teaspoon baking powder
1/4 teaspoon baking soda
1/8 teaspoon salt
3 tablespoons chilled stick margarine or butter, cut into small pieces
1/2 cup low-fat buttermilk
Cooking spray
6 tablespoons frozen reduced-calorie whipped topping, thawed
Whole strawberries (optional)