Sweet Brown Rice Risotto with Kale and Cremini

Name: Sweet Brown Rice Risotto with Kale and Cremini
Ingredients: 1 quart mushroom broth; 1 quart vegetable broth; 1/4 cup extra-virgin olive oil, plus more for drizzling; 10 ounces cremini mushrooms, thinly sliced; Fine sea salt; Pepper; 3/4 pound Tuscan kale, stemmed, leaves chopped into 1/2-inch pieces; 2 tablespoons unsalted butter; 1 yellow onion, minced; 2 cups sweet brown rice; 1 cup dry white wine; 1 tablespoon chopped thyme; 1/3 cup freshly grated Parmigiano-Reggiano cheese, plus more for serving