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Creamy Green Bean & Mushroom Casserole

Name: Creamy Green Bean & Mushroom Casserole
Cook time: 1 h 35 min
Total time: 1 h 35 min
Yield: 6 servings
Ingredients: 1 lb cremini mushrooms; 1 1/2 lbs green beans; 1/2 medium yellow onion; 1 small pkg fresh thyme; ¼ cup buttermilk; ½ cup heavy whipping cream; 2 cups whole milk; ⅓ cup Parmesan cheese, shredded; 5 tbsp butter, unsalted; 4 tsp extra virgin olive oil; ½ cup all-purpose flour; 1 ½ tbsp salt; ¾ tsp black pepper; ¾ tsp garlic powder; ¼ tsp onion powder