I also found this recipe in Home Cookin' With Dave's Mom (as in David Letterman).
I was cleaning out some old recipe cards and found this recipe and was going to post it. Of course, it's already here. I got mine in the early 80's from Gloria Pitzer's newsletter. She was doing copycat recipes when Todd Wilbur was still eating his crayons. I've used this recipe many times. Royal Baking Powder was THE baking powder for decades. This recipe makes 12 teaspoons, BTW.