In a medium saucepan, cook the rice according to package instructions. This usually involves combining rice and water, bringing it to a boil, reducing the heat to low, and simmering for 15–20 minutes until water is absorbed.
While the rice is cooking, melt the butter in a separate saucepan over medium heat.
Add the French onion soup, garlic powder, black pepper, and salt (if needed) to the melted butter. Stir well and let it simmer for 2–3 minutes to meld the flavors.
Once the rice is cooked, add it to the saucepan with the French onion butter sauce.
Stir to evenly coat the rice with the sauce, ensuring every grain is infused with flavor.
Let the rice and sauce simmer for another 3–4 minutes, stirring occasionally to meld the flavors further.
Remove from heat, garnish with fresh parsley if desired, and serve hot.