Preheat oven to 400 degrees F.
In a medium bowl, whisk together eggs, milk, salt, and pepper.
Stir in basil.
In a large cast iron skillet, add butter over medium heat and cook until melted.
Remove from heat and then pour in egg mixture.
Sprinkle with tomatoes and cheese.
Bake in preheated oven for 25-30 minutes, or until edges are golden and middle is set.
Garnish with additional fresh basil.
Serve and enjoy!