Preheat oven to 450º. Process first 4 ingredients in a blender until blended. Stir together chives and next 2 ingredients in a small bowl. Layer tomatoes, 1 cup cheese, and chive mixture in a lightly greased 13- x 9-inch baking dish. Pour egg mixture over top, and sprinkle with remaining 1/2 cup cheese.
Bake at 450° for 18 to 20 minutes or until set.
Note: Mixture will rise about 1 inch above rim of baking dish.