Buy it and follow the directions on the bag. I can't see fast food with alot of outlets using any thing else.
http://www.recipegoldmine.com/ccP/p46.html POPEYE'S BISCUITS 4 cups Bisquick 4 ounces sour cream 1 cup club soda (at room temperature) 1/2 cup (1 stick) margarine Preheat oven to 375 degrees F. Mix Bisquick, sour cream and club soda together. Pour onto floured surface and knead very lightly. Roll out to about 1/2-inch thickness and cut with cutter. Melt butter and pour half into a glass casserole dish. Place biscuits in dish and pour remaining butter over top of biscuits.
Popeye's likely has a special dough recipe made for them by a food manufacturer, and they buy the biscuit doughs already cut out and frozen, and then bake them in each store.