Mushroom & Bacon Casserole

INGREDIENTS

4 cups

unsalted beef stock (such as Swanson)

3 cups

water

center-cut bacon slices, chopped

1 cup

chopped onion

1 tbsp

chopped fresh thyme

garlic cloves, minced

8 oz

sliced cremini mushrooms

8 oz

sliced shiitake mushroom caps

1/2 tsp

kosher salt

2 cups

uncooked pearl barley

1/3 cup

Madeira wine

4 oz

Gruyère cheese, shredded (about 1 cup), divided

1/2 cup

chopped drained oil-packed sun-dried tomato halves

2 tsp

lower-sodium soy sauce

1/4 tsp

black pepper

1 10 ounce package

frozen chopped spinach, thawed, drained, and squeezed dry

Cooking spray