INGREDIENTS
1 tbsp
olive oil
3
yellow onions (, large, sliced)
1/4 tsp
salt
1 tbsp
balsamic vinegar
1 tbsp
olive oil
10 oz
mushrooms (, sliced (I used button mushrooms))
6 oz
spinach
1 cup
half-and-half
1 cup
Parmesan cheese (, shredded)
1/4 tsp
salt
8 oz
farfalle pasta