Heat oven to 400 degrees and prepare a baking sheet with cooking spray.
Combine Bisquick, 1 teaspoon garlic powder, salt and shredded cheddar cheese in a medium mixing bowl. Stir dry ingredients well.
Add 4 tablespoons of butter, cold and diced into cubes, and skim milk to dry mixture. Using a biscuit cutter or a large fork, mash all ingredients together to form a sticky dough. To fully combine the cold butter the mashing (not stirring) is necessary.
Spoon biscuit dough onto cookie sheet making either 8 large or 16 small biscuits.
For large biscuits, bake for 12 minutes at 400 and then reduce temperature to 300 and bake for an additional 4 minutes or until tops are lightly browned. For small biscuits cook for 12 minutes at 400 or until tops are lightly browned.
Melt 2 tablespoons butter with 1/2 teaspoon garlic powder and dash of salt. Baste over the tops of biscuits right after you take them out of the oven. Sprinkle the tops with dried parsley.