Heat broiler. Melt butter in an 8-inch nonstick ovenproof skillet over medium-high heat until foamy. Crack eggs into skillet, and cook until whites are almost set, about 1 1/2 minutes.
Remove from heat. Season eggs with salt and pepper, and top with tomatoes, then cheese. Broil until whites are set and cheese melts and is bubbling, about 1 minute
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