In a large skillet, cook bacon over medium heat until crisp. Remove to paper towels to drain; crumble. Unfold 1 sheet of puff pastry. Sprinkle with half the brown sugar and half the bacon.
Roll up the left and right sides toward the center, jelly-roll style, until rolls meet in the middle. Repeat with remaining pastry sheet and ingredients. Refrigerate until firm enough to slice, about 30 minutes.
Preheat oven to 400°. Cut each roll crosswise into 1/2-in. slices. Place 2 in. apart on parchment-lined baking sheets. Bake until golden and crisp, 15-20 minutes. Cool on pans 2 minutes. Remove to wire racks to cool.
Freeze option: Cover and freeze unbaked sliced palmiers on waxed paper-lined baking sheets until firm. Transfer to freezer containers; close tightly and return to freezer. To use, thaw and bake palmiers as directed.
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