PASTRY: * 1/2 lb. butter * 1/2 cup cold water * 1/4 tsp. baking powder * 2 cups all purpose flour * 1/4 tsp. salt FILLING I * 1/4 lb. feta Cheese crumbled * 1/2 lb. cottage cheese * 1 egg * salt to taste FILLING II * 1 lb. cottage cheese * 1/4 lb. grated Cheddar Cheese * 1 egg