Unwrap thawed puff pastry sheet and slice in half.
On each half: spread about 2 tablespoons of pesto into a thin layer, then sprinkle with ½ cup.
Roll up tightly from the long side. Wet the edge with your finger and a bit of water to seal and wrap tightly with plastic wrap. Chill at least one hour (or up to 2 days).
Preheat oven to 425°F. Line 2 cookie sheets with parchment paper or a silicone baking mat. Remove rolls from refrigerator and unwrap, then slice ½” slices. Lay flat on baking sheets.
Bake for 6-8 minutes or until puffy and golden brown. Serve hot.
