This lightened classic is guaranteed to make spinach a popular vegetable around your house. This is good news since spinach is an excellent source of vitamins A and C, both of which help keep immune systems strong.
Combine milk and flour, stirring well with a whisk.
Heat a medium saucepan over medium-high heat. Coat pan with cooking spray. Add leek and garlic; sauté 2 minutes or until tender. Add spinach, and sauté 1 minute. Stir in milk mixture; cook 1 1/2 minutes or until slightly thick, stirring occasionally.
Add cheese, salt, and pepper to spinach mixture in pan, stirring until smooth; cook 1 minute.