Sauté Onions:In a large skillet or saucepan, melt butter over medium heat. Add sliced onions and cook, stirring frequently, until caramelized and golden brown, about 10–15 minutes.
Add Garlic and Rice:Stir in garlic and cook for another minute. Add rice to the pan, stirring well to coat evenly with butter and onions.
Add Broth and Seasonings:Pour beef broth and Worcestershire sauce into the pan. Add thyme, salt, and pepper, stirring to combine. Bring to a boil, then reduce heat to low, cover, and simmer for 18–20 minutes or until rice is tender and liquid is absorbed.
Add Cheese:Remove from heat, sprinkle cheese evenly over rice, cover again, and let sit for about 5 minutes to allow cheese to melt.
Serve:Fluff rice gently with a fork. Garnish with fresh chopped parsley if desired and serve hot.