1-Preheat the oven to 350°F (177°C) and lightly grease a baking pan to prevent sticking and ensure easy cleanup.

2-In a large bowl, mix all the filling ingredients including the sliced pears and apples, brown sugar, flour, vanilla extract, cinnamon, nutmeg, and salt until everything is well combined, then spread it evenly in the prepared pan.

3-For the topping, whisk together the flour, brown sugar, and cinnamon in a medium bowl, then cut in the cold, cubed butter using a pastry cutter or fork until it forms a crumbly texture; stir in the oats and pecans (if using) last to keep their crunch.

4-Sprinkle the topping evenly over the fruit filling in the pan, making sure to cover it well for that irresistible contrast of textures.

5-Bake for 40 to 45 minutes, until the topping turns golden brown and the fruit mixture bubbles at the edges, filling your kitchen with a cozy aroma.

6-Remove from the oven and let it cool on a wire rack for at least 5 minutes before serving, as this allows the flavors to settle and makes it safer to enjoy.

7-Store any leftovers covered in the refrigerator for up to 5 days to keep them fresh.