Heat oven to 400°F. Grease 2 quart round baking dish.
In 12-inch nonstick skillet, heat oil over medium-high heat. Saute white potatoes 5 minutes, stirring occasionally; add sweet potatoes and saute 5 minutes, stirring occasionally. Stir in onion, bell pepper and garlic; cook and stir 5 minutes longer or until potatoes are firm but tender. Stir in basil, oregano, salt, pepper and cayenne.
In 2 cup measure, stir together chicken broth and rice flour blend. Push potatoes to one side of skillet. Over medium heat, quickly whisk in broth mixture until bubbly; stir potato mixture into sauce; cook and stir 1 to 2 minutes or until thickened. Spoon potato mixture into baking dish.
Knead dough until softened and no longer crumbly. Flatten into a round. Place between 2 sheets of cooking parchment or waxed paper. Roll into a 10-inch circle. Cut dough into 6 to 8 shapes, using a 2 1/2-inch decorative cutter. Place shapes of dough evenly over sweet potato mixture. Sprinkle dough with Parmesan cheese.
Bake 12 to 18 minutes or until pastry is dry and begins to brown.