PREPARE THE INVOLTINI: In a separate small bowl, mix the oregano, salt, and red pepper flakes together. Lay a chicken cutlet lengthwise on your work surface and season it all over with the salt mixture. Place a piece of prosciutto on top, followed by a piece of provolone folded in half. Top with 1 sun-dried tomato. Roll the cutlet, enclosing the fillings, and secure with 2 parallel skewers. Repeat with the remaining ingredients, placing 2 rolls on each pair of skewers for easy flipping.