CONVENTIONAL OVEN
Preheat oven to 400°F. Remove frozen soup from packaging and place in ovenproof bowl. Heat for 40 to 45 minutes on center rack. Finish under broiler for 1 to 2 minutes to brown the cheese, if desired.
MICROWAVE AND CONVENTIONAL OVEN
Preheat oven to 400°F. Remove frozen soup from packaging and place in ovenproof and microwave-safe and ovenproof bowl. Heat in microwave for 4 minutes on high. Place bowl on a baking sheet and heat in oven for 15 to 20 minutes on center rack. Finish under broiler for 1 to 2 minutes to brown the cheese, if desired.
For a larger quantity, add a few minutes to heating time.