Easy Cheesy Mac & Cheese

Directions

1. 1
   Heat oven to 350F.
2. 2
   Cook macaroni as directed on package, omitting salt.
3. 3
   Meanwhile, melt butter in large saucepan on medium heat.
4. 4
   Add onions; cook 3 min.
5. 5
   or until crisp-tender, stirring occasionally.
6. 6
   Add flour; cook and stir 1 min.
7. 7
   Gradually add milk; cook 5 min., stirring constantly.
8. 8
   Simmer on low heat 10 min., stirring frequently.
9. 9
   Remove from heat.
10. 10
    Stir in 2 cups cheese.
11. 11
    Drain macaroni.
12. 12
    Add to cheese sauce; stir until evenly coated.
13. 13
    Spoon into casserole dish sprayed with cooking spray; sprinkle with remaining shredded cheese.
14. 14
    Bake 20 min.
15. 15
    or until heated through.