In a large bowl, combine the flours, baking powder, salt, 1/4 teaspoon garlic powder and baking soda. Cut in 3 tablespoons butter until mixture resembles coarse crumbs; add cheese. Stir in buttermilk just until moistened., Drop by 2 tablespoonfuls 2 in. apart onto baking sheets coated with cooking spray. Bake at 425° until golden brown, 10-12 minutes. Melt remaining butter; stir in parsley and remaining garlic powder. Brush over biscuits. Serve warm.