½ Tbsp. unsalted butter
2 cups (about ½ pound) thinly sliced button mushrooms
Kosher salt and freshly ground pepper
2 cloves garlic, minced
⅓ cup chicken or vegetable broth
2 Tbsp. cream cheese
3 Tbsp. grated Parmesan cheese
2 cups fresh baby spinach
4 oz dry bucatini, fettuccine, or spaghetti, cooked according to the package directions and drained