Cauliflower and Goat Cheese Gratin

Name: Cauliflower and Goat Cheese Gratin
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: French
Ingredients: 2 tablespoons unsalted butter (+ more for baking dish unsalted butter); 3 cups whole milk (room temperature); 2 tablespoons unbleached all purpose flour; 1 ½ cup Monterey jack cheese ( grated ); 6 ounces goat cheese (cut into small pieces); ½ cup parmesan cheese (grated); 1 cauliflower (head cut into florets ); salt and pepper (to season); 1 tablespoons chives (chopped finely); lemon (sliced and optional)