Risotto with Porcini Mushrooms and Mascarpone

INGREDIENTS

2 cups

boiling water

1 cup

dried porcini mushrooms (about 1 ounce)

1 14 ounce can

less-sodium beef broth

Cooking spray

1 cup

uncooked Arborio rice or other short-grain rice

3/4 cup

chopped shallots

garlic cloves, minced

1/2 cup

dry white wine

1/4 cup

grated Parmigiano-Reggiano cheese

1 tbsp

chopped fresh thyme

1/2 tsp

salt

1/2 tsp

freshly ground black pepper

1/4 cup

mascarpone cheese

Fresh thyme leaves (optional)