Caramelize the sugar: In a 10-inch ovenproof skillet over medium heat, melt butter and sugar until golden and bubbly. Stir in vanilla and a pinch of salt.
Arrange apples cut-side up in the skillet. Cook for 15–20 minutes, occasionally spooning caramel over them, until softened.
Top with puff pastry: Drape over the apples, tucking edges down around fruit. Cut a few slits in the top to vent.
Bake for 25–30 minutes until the pastry is golden and crisp.
Cool slightly, then place a plate over the skillet and carefully invert.
Serve warm with crème fraîche, ice cream, or just as-is!
Notes
Use caution when flipping—caramel is hot!
Can be made a few hours ahead and rewarmed before serving.
Nutrition (per serving): Calories: 320 | Carbs: 42g | Protein: 2g | Fat: 17g | Cholesterol: 35mg | Sodium: 100mg | Potassium: 150mg | Fiber: 3g | Sugar: 27gAn automated tool is used to calculate the nutritional information. As such, I cannot guarantee the accuracy of the nutritional information provided for any recipe on this site.