Preheat oven to 425°F. Lightly oil
or spray a cookie pan with olive oil.
Slice vegetables and roast for
about 20 minutes, turning once. Onions and peppers will take longer than mushrooms,
which can be added when you turn the vegetables.
While vegetables are roasting, cut
roll into small cubes (less than an inch). Spread cubes evenly over the bottom of
2-quart baking dish. Layer vegetables on top of bread. Spread crumbled feta cheese
evenly over vegetables.
Beat eggs with sour cream and cream
cheese. Pour egg mixture over vegetables. Bake at 350°F for 45 minutes. Let sit for
minutes before serving.