Preheat oven to 450F. Butterly the pork tenderloin by cutting 1 or 2 strips through the meat of the pork.
Put plastic wrap over pork and pound out the meat to 1/2 inch thickness using the smooth side of the meat hammer. Season with salt and pepper and pound lightly with spiked side of meat hammer.
Add olive oil to pan can bring to high heat. Add garlic and let cook for 30-60 seconds, then add spinach and saute until wilted.
Lay slices of prosciutto over pork tenderloin to cover entire surface. Then pour spinach over the pork tenderloin. Make sure all the oil gets in there too.
Rip pieces of cream cheese off and lay them on the pork.
Roll the pork up and use toothpicks to secure the end. You can also use butchers string to do this.
Add seasonings to outside of pork (I used pepper, Mrs. Dash, and minced garlic).
Bake for 20 minutes at 450F and then reduce heat to 325F and cook for 60-75 minutes until internal temperature reads 145F.