Creamy Skillet Pasta with Spinach and Portobello Mushrooms

large portobello mushroom caps thickly sliced and cut into bite size pieces.  *Note be sure to remove the brown gills Portobello Mushrooms

Chopped Shallot

Baby  Spinach

u ncooked whole wheat pasta

g ood quality olive oil, divided

 u nsalted chicken stock - You can use vegetable stock to make dish vegetarian

 c ourse ground black pepper

p armigiano- reggiano cheese