Preheat your oven to 350° and prepare an 8x8-inch baking dish. Spray the dish with cooking spray.
For the topping, combine the butter, rolled oats, dark brown sugar, flour, cinnamon, and pecans (optional) in a medium bowl and mix together. The mixture should be crumbly but not dry.
For the filling, in a large bowl add the chopped pears, blueberries, spices, lemon juice, sugar, cornstarch, and salt. Pour into your baking dish.
Crumble the crisp topping over the pears and blueberries.
Bake in preheated oven for 25 minutes or until the filling is bubbling and the topping is crisp!
Let cool 10 minutes before digging in! Top with vanilla ice cream and enjoy!