Au Gratin Brussels Sprouts

Name: Au Gratin Brussels Sprouts
Prep time: 30 min
Cook time: 30 min
Total time: 30 min
Yield: 6
Cuisine: Global
Ingredients: 680 grams fresh brussels sprouts or 20 ounces frozen brussels sprouts, trim and rinse if using fresh; 2 Tbsps butter or margarine; 2 Tbsps flour; 59 milliliters milk, plus; 2 Tbsps grated parmesan cheese; 0 teaspoons salt; 237 milliliters shredded cheddar cheese; 237 milliliters sour cream