Preheat oven to 400°F and line a baking sheet with parchment paper.

Slice apple either horizontally or vertically to create large cross-sections. Remove seeds and stem pieces.

Stir together mascarpone, honey, cinnamon, and nutmeg.

Roll out puff pastry and cut into 9 sections.

Place an apple slice in the center of each pastry and trace around the apple with the tip of a knife.

Remove the apple and spread some of the mascarpone in the circle, then replace the apple, pressing down.

Repeat with remaining pastry, apples, and mascarpone.

Bake tartlets for 10-15 minutes, until golden brown.