Lay veal on flat surface.
Place cheese on each piece, topped by a of slice prosciutto; sprinkle with salt and pepper.
Roll up; secure with toothpicks.
Heat olive oil in saute pan.
Dust veal rolls in flour.
Place in pan, saute on both sides until brown, about 2 minutes on each side.
Remove from heat; drain off oil.
Add 1/2 stick butter, another pinch of salt, another pinch pepper, sage and thyme.
Deglaze pan with 1/2 cup white wine.
Reduce by 3/4.
Add mushrooms and 1/4 cup of the chicken stock.
Reduce by half.
Add 1/4 cup marinara and remaining chicken stock.
Reduce until desired consistency.
Place veal on platter; remove toothpicks.
Finish plate with sauce and serve.