Preheat oven to 350 degrees.
Toss the pears with orange juice, maple syrup and arrowroot (or flour) and transfer to an 8x8 baking dish.
In a bowl of a mixer pitted with the paddle attachment, combine all of the topping ingredients and blend until the mixture resembles small peas. This can also be done by hand with a pastry blender. Squeeze with your hands to create small clumps.
Arrange topping over fruit to cover.
Place baking dish on a cookie sheet and bake for 50-60 minutes or until bubbly and topping is golden brown.
Serve warm or at room temperature with vanilla ice cream, if you like.
To make crisp in a 13 x 9 –inch baking dish, double all ingredients and bake for at least 1 hour. If the topping starts to get too dark before the fruit softens, cover loosely with a piece of foil.