Preheat oven to 350 degrees F (175 degrees C). Prepare a 2-quart shallow baking dish with cooking spray.
Stir eggs and cream of mushroom soup together in a large bowl until smooth. Stir Cheddar cheese, roast beef, and black pepper into the egg mixture.
Bake in preheated oven until set in the the center and golden brown on top, 45 to 50 minutes.
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