Heat the butter in a 10-inch skillet or 4-to 6 quart pot over medium-high heat
Add the onion and minced garlic and stir until fragrant, about 2 minutes
Add the mushrooms and cook until browned and softened, about 6-8 minutes
Stir in the rice and herbs and cook, stirring, 2-3 minutes until the rice begins crackling
Stir the soup and 3 cups of water or stock in the skillet and heat to a simmer, 2-3 minutes more
Reduce the heat to low
Cover and cook for 20 minutes or until the rice is tender
Remove the skillet or pot from the heat
Let stand for 5 minutes
Season to taste before serving
If you’d like the rice to be more creamy, add some or all of the reserved ½ cup of water or stock
