Preheat oven to 350°F (180°C).
Spray 15 x 10-inch (40 x 25 cm) jelly-roll pan with cooking spray. Sprinkle bread crumbs over bottom of pan. Scatter ham, vegetables, green onions and cheese in pan.
Whisk eggs, milk and cayenne pepper just until blended. Pour over ingredients in pan.
Bake in preheated 350°F (180°C) oven until egg mixture is just set, about 25 minutes. Do not overbake. Let stand 5 minutes.
Cut into rectangles and serve hot, warm or at room temperature.
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