Preheat oven to 400 degrees F. For each calzone, place potato slices in single layer on microwave-safe plate. Cover with plastic wrap; vent. Micro-cook on high (100% power) 2 to 3 minutes or until tender. Remove wrap; cool.
On lightly floured surface, place round of calzones dough. Layer potato slices on half of dough circle, to within 1-inch of edges. For Feta and Prosciutto Variation, layer red sweet peppers, prosciutto, feta cheese, and fresh dill. For Ricotta and Ham Variation, in a small bowl combine ricotta, Parmesan cheese, and chives. Spread ricotta mixture evenly over potato slices. Top with ham.
Moisten edges with water. Fold dough in half over filling. Seal. Place calzone on lightly greased or parchment-lined baking sheet. Brush with olive oil.
Bake in preheated oven for 25 minutes or until golden. Serves 4 to 6.