1. Preheat oven to 375 degrees F. Line a baking sheet with aluminum foil and set aside.
2. Butter one side of each piece of bread. Place 4 slices, buttered-side down, on prepared baking sheet. Layer half of cheese slices on bread followed by bacon and scallions. Place remaining cheese slices on top. Cover each sandwich with remaining 4 slices of bread, buttered side up.
3. Bake sandwiches until bottoms are a toasted golden brown, about 10 minutes. Flip and continue to bake until cheese melts and other side is toasted, 8 to 10 more minutes. Serve immediately.
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