Combine soup and milk in 2 quart microwavable shallow casserole. Stir in pasta, tuna, 2/3 cup French fried onions, vegetables and cheese.
Cover; microwave on high for 10 minutes or until heated through, stirring halfway through cooking time. Top with remaining 2/3 cup onions. Microwave 1 minute or until onions are golden. (or bake, covered, in 350 oven for 25 - 35 minutes.
TIP: Garnish with chopped pimento and parsley sprigs, if desired.