pound butterflied skirt steak to approximately 1/4 inch thick. Salt and pepper and set aside.
cook proscuitto in olive oil until slightly crisp.
Add shallots and cook until tender, approximately 2 minutes.
Add mushrooms and cook until brown.
Add sundried tomatoes and cook an additional minute.
Turn off heat and add spinach. Stir to incorporate.
Spread mixture over butterflied steak. Sprinkle goat cheese over mixture and salt and pepper. Fold ends in and tie with kitchen string.
Grill on 400 degrees. Rub olive oil on the outside of the steak. Grill 4 to 5 minutes on each side or until a crust forms. Remove and let rest for 10 minutes.
Slice and serve.