Preheat oven to 400° place a rack on the top setting.
Pour broth into a medium saucepan and place over medium low heat.
Strip leaves from rosemary and thyme, set aside.
Line a cookie sheet with parchment paper.
Chop the mushrooms. Combine them in a bowl with 1-2 tsp olive oil, 1/2 the rosemary leaves, and a pinch of salt and pepper. Toss and spread into a single layer on the prepared cookie pan. Place the pan on top rack, 4-5 inches from the top of the oven. Roast for 15 - 20 minutes or until lightly browned and tender, stirring halfway through. Once done, remove pan from oven and set aside.
While mushrooms roast - melt butter in a large saucepan over medium heat until bubbling subsides. Add the rice. Cook stirring until rice is opaque and lightly golden.
Add the rosemary, thyme, and onions to the rice and sauté until slightly softened, 3-5 minutes.
Add the garlic and stir for 1 minute more.
Using a ladle add 3 ladles full of broth to the rice. Simmer over medium low-medium heat, stirring until the liquid is almost completely absorbed. Continue adding broth 1 ladle at a time stirring and agitating the pan, allowing broth to be absorbed between each addition. Continue until rice has reached desired doneness, al dente will still have a slight underdone center. You may not need to use all the broth.
Once the rice has reached desired doneness, add the mushrooms, sour cream (optional), lemon juice, parmesan, and parsley, and stir until well combined. Season with salt and pepper to taste.
Serve immediately.
Notes
OPTIONAL:
Can use veggie or beef broth for a lighter or richer flavor.
Splash with a squeeze of lemon juice before serving.
Perfect as a main course but also wonderful with grilled steak, chicken or fish.