Preheat the oven to 375 degrees and lightly grease a baking dish.
Arrange the pear halves cut side up in the prepared dish.
Stir together the melted butter, maple syrup, cinnamon, and salt in a small bowl.
Brush the mixture evenly over the pears, letting some pool in the centers.
Bake for 25 to 30 minutes until the pears are tender when pierced with a fork.
Remove from the oven and let them rest for 5 minutes.
Spoon a dollop of mascarpone over each pear half and sprinkle with the chopped pecans before serving.