Preheat oven to 400º. Spray the bottom of a muffin tin with non-stick cooking spray.
Unfold the Puff Pastry Sheet and roll it out so it's slightly larger than it was.
Cut the Puff Pastry Sheet into six squares.
Place each Puff Pastry Sheet square on top of each muffin tin cup creating a bowl.
Bake for 20 minutes or until Puff Pastry is flaky and golden brown.
While the Puff Pastry Sheet squares are baking, prepare the ceviche.
Add chopped shrimp, jalapeno, onion, tomatoes, and avocado into a medium bowl.
Stir in the lime juice and add salt to season.
Chill the ceviche until the Puff Pastry cups are cool.
Then, fill each cup with ceviche.
Garnish with chopped scallions or chives, if desired.
Serve with lime wedges and hot sauce.