Cheesy Potato Spoon Bread

4 cups mashed potatoes 1 cup all-purpose flour 3 tablespoons soy margarine 1/2 teaspoon onion powder salt 1/2 teaspoon white pepper 1/2 cayenne pepper[...]

1 (1/4 ounce) envelope active dry yeast 1 cup warm milk 1/3 cup vegetable shortening , at room temperature 1 large egg 1 teaspoon salt 1/2 teaspoon black[...]