Preheat your oven to 350 degrees f.
Rinse and peel your pears. Remove the stems. Slice the pears (avoiding the core) into pieces about ⅓-inch thick.
Place your pears in an ungreased pie dish and toss them with cinnamon.
Give your pecans a rough chop.
In a mixing bowl, combine your pecans and all remaining ingredients with a fork.
Sprinkle your pears with your topping mixture, spreading it evenly.
Bake for 35-40 minutes, or until the fruit is bubbling, and the topping is crisp and golden.
Let your pear crumble cool for 10 minutes before serving.