Upside-Down Skillet Apple Tart

Ingredients

1 1/2 sticks unsalted butter
1 cup light brown sugar
1/2 teaspoon cinnamon
Pinch of nutmeg
5 to 6 apples (such as Cortland, Rome or Granny Smith), peeled, quartered, cored and rubbed with lemon juice to prevent them from discoloring
1 sheet homemade or prepared puff pastry
Flour for dusting, as needed
Sweetened whipped cream for serving

Preheat oven to 400 degrees F. In a 9 or 10-inch cast-iron skillet, melt 1 stick of the butter over medium heat. Stir in sugar and spices, bring to a slow boil and cook, stirring, until mixture is a smooth caramel-colored sauce. Fit in apple quarters, round-side down; reduce heat to low.
On a lightly-floured work surface roll out puff pastry until it is 1-inch in diameter larger than skillet. Prick all over with a pastry docker or with tines of a fork. Cut the remaining 1/2 stick butter into small pieces and dot the tops of the apples. Fit pastry round carefully over apples and butter, tucking in edges. Set the skillet on a rimmed baking sheet and transfer to the oven and bake 25 minutes, or until pastry is golden brown.
Remove skillet from oven. To unmold, loosen pastry around edges with a small, sharp knife.
Invert a serving plate over top of pan. Using oven mitts, hold both pan and plate and in one motion, flip pan upside-down and set down. Tap bottom of pan gently to make sure tart is released. Lift off pan and serve warm or at room temperature.