01 - Preheat oven to 425°F. Toss mushrooms with 1 tbsp olive oil, 1/4 tsp salt, and a pinch of pepper. Spread on a baking sheet and roast for 20–25 minutes, stirring once, until golden and tender.
02 - Rinse the rice under cold water until the water runs clear; drain well.
03 - In a large saucepan over medium heat, melt 2 tbsp butter with 1 tbsp olive oil. Add onion and sauté 3–4 minutes until translucent.
04 - Add the minced garlic and cook for 1 minute until fragrant.
05 - Stir in the drained rice and toast for 1–2 minutes, stirring constantly.
06 - Add vegetable broth, thyme, remaining salt, and pepper. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes, or until rice is tender and liquid is absorbed.
07 - Remove from heat and let rest, covered, for 5 minutes.
08 - Fluff rice with a fork. Gently fold in roasted mushrooms, remaining 1 tbsp butter, and parsley. Adjust seasoning to taste. Garnish with chopped chives and serve warm.