1-First: preheat the oven to 375°F and grease a medium-sized baking pan, about 6 quarts, with butter or nonstick spray. Then, toss the sliced pears with the brown sugar and cornstarch before placing them in the prepared pan for the filling. In a separate bowl, mix the flour, oats, walnuts, baking powder, salt, and cinnamon to create the topping base.

2-Next: beat the butter and brown sugar until they are light and creamy, then add the dry mixture all at once and combine until crumbly. Press the mixture together with your hands and drop clumps over the pear filling in the pan. Bake for 35 to 45 minutes until the topping turns golden and the filling bubbles, then let it cool slightly before serving warm, perhaps with whipped cream or ice cream for added enjoyment.