Sweet Potato Croissants

Ingredients (9)

• Two .25-ounce packages active dry yeast
• 1 cup warm water
• One 15-ounce can sweet potatoes,
• 1/2 cup granulated white sugar
• 1/2 cup (solid) shortening
• 1 large egg
• 1 1/2 teaspoons salt
• 5 to 5 1/2 cups all purpose flour
• 1/4 cup (1/2 stick) butter,