Easy Creamed Spinach

Bahan-bahan (4 porsi)

• 16 ounces baby spinach leaves (washed and dried)
• 1/3 cup unsalted butter (divided)
• 1 onion (chopped)
• 3 cloves garlic (finely chopped or minced)
• 4 tablespoons all-purpose flour
• 1 cup milk (or half and half)
• 1 pinch ground nutmeg (optional)
• 1 pinch cayenne pepper (optional)
• 1/4 teaspoon salt (to taste)
• 1/4 teaspoon pepper (to taste)
• 2 tablespoons parmesan cheese (grated, to serve)