Making these delightful Apple Pie Cookies is not only fun but also quite simple. Here are the steps you need to follow:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C). Line a baking sheet with parchment paper.
2. Prepare the Dough: In a large bowl, whisk together the flour, cinnamon, nutmeg, and salt.
3. Cream Butter and Sugar: In another bowl, cream together the softened butter and granulated sugar until light and fluffy using an electric mixer.
4. Add Egg and Vanilla: Beat in the egg and vanilla extract until fully incorporated.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the wet mixture, mixing until just combined.
6. Prepare the Apple Filling: In a separate bowl, toss the diced apples with brown sugar, lemon juice, and cornstarch until well mixed.
7. Roll the Dough: Scoop about a tablespoon of the cookie dough and flatten it slightly in your hand.
8. Add the Filling: Place about a teaspoon of the apple mixture in the center of the flattened dough.
9. Seal the Cookies: Carefully fold the dough over the filling and pinch the edges to seal completely. Roll it into a ball if desired. Repeat with the remaining dough and filling.
10. Bake: Place the filled cookies on the prepared baking sheet and bake in the preheated oven for 15-20 minutes, or until golden brown.
11. Cool: Allow the cookies to cool on the baking sheet for about 10 minutes before transferring them to a wire rack to cool completely.
12. Sprinkle with Cinnamon-Sugar: If desired, sprinkle cinnamon-sugar over the cookies while they are still warm for an extra sweet touch.

These steps guide you through creating mouthwatering Apple Pie Cookies full of flavor and nostalgia!