Mushroom Mac & Cheese

Name: Mushroom Mac & Cheese
Cook time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 1 pound uncooked elbow macaroni pasta; 3 TBSP unsalted butter; 12 ounce mix of cremini, shiitake, and oyster mushrooms, thinly sliced; 3 TBSP all-purpose flour; 1/2 tsp garlic powder; salt & pepper; 3 cups whole milk; 6 ounces sharp white cheddar cheese, shredded; 6 ounces gruyere cheese, grated