Preheat the oven to 350 degrees F. Spray an 8x8 inch baking dish with nonstick spray.
Place the pears in the baking dish and cover them with the brown sugar and cinnamon. Toss well.
In a larger bowl, whisk together the flour, sugar, cinnamon, salt and nutmeg. Use a fork to smash in the softened butter, then use your hands to bring the mixture together. You want it to resemble sand and stick together when your hands squeeze it. It will take about 5 minutes to bring the mixture together and incorporate it with your hands.
Sprinkle the crumble mixture over top of the pears. Bake for 35 to 40 minutes, or until the crumble looks golden and crunchy on top. Let cool slightly before serving.
Serve with vanilla ice cream.