Preheat the oven to 400ºF. In a small bowl, toss the pear slices with the melted butter, rosemary, and a pinch of salt. Spread them out on a parchment lined baking sheet.
Roast in the oven for 12-15 minutes until caramelized and fragrant.
On a separate parchment lined baking sheet, spread the slices of prosciutto. Bake for 5-7 minutes until crisp. Let them cool and then break them up into shards. Set aside.
In a food processor, combine the softened goat cheese, heavy cream, and a pinch of salt. Pulse until smooth, adding a bit more heavy cream if needed for consistency.
On your serving plate, spread the whipped goat cheese. Use the back of the spoon to smooth out. Arrange the roasted pears on top. Then sprinkle the prosciutto shards and crushed pistachio on top. Serve with a large serving spoon alongside crostini or crackers.