Preheat the oven to 400 degrees F.
Line a sheet pan with parchment paper and place a baking rack on the sheet pan. Arrange the bacon in one layer on the baking rack. Bake for 25 minutes until it's deep golden and crispy. Transfer the bacon to a plate lined with paper towels.
Toast the bread slices and slather them with butter.
Arrange 4 slices of bacon on every other slice of bread and top with second slice of bread to make four sandwiches. Slice each sandwich in half diagonally and serve.
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