
4 cups vegetable cooking stock
4 tablespoons unsalted butter, divided
1 small yellow onion, finely chopped
1½ cups sliced baby bella mushrooms
2 cloves garlic, minced
2 teaspoons dried thyme leaves
½ cup each freekeh, bulgur and farro
½ cup dry white wine, such as Chardonnay
½ cup shredded smoked Gouda cheese
¾ cup lightly packed baby spinach, stems removed
Salt, to taste
Black pepper, to taste
Shaved Parmesan cheese, for garnish