Preheat the Oven: Set the oven to 350°F, ensuring the rack is in the center.
Prepare the Pears: Peel, core, and slice the pears. In a large mixing bowl, combine the pears, brown sugar, cinnamon, ginger, and cornstarch. Mix until the pears are well-coated.
Assemble the Filling: Pour the pear mixture into the bottom of a 2-quart baking dish. Evenly distribute the sliced butter on top of the pears.
Make the Biscuit Topping: In a medium bowl, whisk together the flour, brown sugar, salt, baking powder, and baking soda. Add in the cold, cubed butter, crumbling it into the flour mixture until the butter forms pebble-sized pieces.
Combine the Buttermilk: Slowly stir in the buttermilk, mixing until the dough comes together. The batter should be thick and sticky.
Top the Pears: Spoon the biscuit mixture over the fruit filling, spreading it out as evenly as possible.
Optional Topping: Sprinkle raw sugar on top of the cobbler for extra crunch and a sparkling finish.
Bake: Place the cobbler in the oven and bake for 40-50 minutes, until the top is golden brown and the filling is bubbling.
Serve: Let cool slightly, then serve warm with salted caramel ice cream for an indulgent treat.