Preheat a convection oven to 175°C (350°F) and line two baking sheets with silicone mats or parchment paper.
In a stand mixer fitted with a paddle attachment, cream the butter and granulated sugar on medium-high speed until the mixture reaches a pale, aerated state.
Incorporate the egg and vanilla extract, mixing until fully emulsified.
Sift together the all-purpose flour, salt, and ground cinnamon in a separate bowl.
Reduce mixer speed to low and gradually add the dry ingredients to the butter mixture until just combined.
Using a rubber spatula, fold in the toasted walnuts and minced dried apples until evenly distributed throughout the dough.
Portion the dough into 25g spheres and place them on the prepared baking sheets, spaced 5cm apart.
Bake for 12 to 15 minutes, or until the edges are firm and exhibit a light golden-brown hue.
Transfer the baking sheets to wire racks and allow cookies to cool completely to ensure proper crumb structure set.