Melt butter in medium saucepan on medium heat. Add flour and mustard; stir. Cook 1 min., stirring constantly. Gradually stir in 2% milk, then evaporated milk; cook 3 to 5 min. or until thickened, stirring constantly. Add 1-1/2 cups cheese; cook and stir 2 to 3 min. or until melted.
Layer potatoes, onions and cheese sauce in 12 (1-cup) baking dishes sprayed with cooking spray; place on rimmed baking sheet. Cover.
Bake 1-1/4 hours or until potatoes are tender. Sprinkle with remaining cheese; bake 5 min. or until melted.
Calories From Fat
% Daily Value*
Total Fat 12g
Saturated Fat 7g
Trans Fat 0g
Total Carbohydrates 20g
Dietary Fibers 2g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.