Italian white sauce mix sandwich

Name: Italian white sauce mix sandwich recipe by Deepa Garg at BetterButter
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Yield: 2
Ingredients: Brown bread 4; For sauce: Maida 1 tbsp; Butter 1 tbsp; Milk 1/2 cup; Salt to taste; Mix vegetables chopped (carrot, beans, onion, celery, capsicum, seedless tomato) 1 cup; Cheddar cheese 1 tbsp; Mozzarella cheese 1 tbsp; Black pepper 1/2 tsp; Butter for brushing