Use the same skillet where the steaks were seared to capture all the flavor left on the bottom. Sauté the garlic over medium heat so it browns without burning, as burnt garlic can make the sauce bitter. Add the milk gradually and stir constantly to avoid lumps. The grated cheese can be Parmesan, mozzarella or another cheese that melts well. Serve with white rice, mashed potatoes, vegetables or a simple salad.