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Stir the flour, brown sugar, baking powder, cinnamon, ginger, and salt together in a medium bowl.
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Add the butter and use your fingers to cut it into the mixture until it comes together and forms large crumbles. (If you want a few really big crumbles, just squeeze the topping in your hands to form larger ones.)
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Sprinkle the topping evenly over the pears.
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Set the baking dish on a large rimmed baking sheet to catch any juices that might spill over and bake 25 to 35 minutes, until the pear juices are bubbling around the edges and the topping is light golden.
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Cool for 20 to 30 minutes to let the juices set up a little bit, then serve with ice cream or whipped cream.