Step 1

Preheat oven to 400°. In an 8-in. cast-iron or other ovenproof skillet, melt butter over medium heat; stir in brown sugar and vanilla until dissolved. Arrange orange slices in a single layer over brown sugar.

Step 2

On a lightly floured surface, unfold puff pastry. Roll to a 9-in. square; place over oranges, tucking in corners.

Step 3

Bake until tart is golden brown and filling is heated through, 20-25 minutes. Cool for 10 minutes before inverting onto a serving plate. Serve warm, with ice cream if desired.