Sweet Potato Angel Biscuits

Wash sweet potatoes; bake at 375° for 1 hour or until done. Let potatoes cool to touch; peel and mash.

Set aside 3 cups and keep warm.

Combine yeast and warm water in a 2-cup liquid measuring cup; let stand 5 minutes.

Combine flour and next 3 ingredients in a large bowl; cut in shortening until mixture is crumbly.

Add yeast mixture and warm sweet potatoes, stirring until dry ingredients are moistened.

Turn dough out onto a lightly floured surface; knead 5 minutes.

Place dough in a lightly greased bowl, turning to grease top.