Oven at 350°F; bake uncovered in an 11x7-in. dish. Cooked chicken breast can replace the tuna. Frozen mixed vegetables or chopped broccoli can stand in for the peas. Full-fat sour cream and regular condensed soup work fine. Make soft bread crumbs by pulsing torn bread in a food processor (1 slice yields about 1/2 to 3/4 cup).
