Alright, start by placing the soft butter in a mixing bowl. Use a hand or stand mixer to beat the butter on medium speed until it's smooth and creamy. Slowly add the powdered sugar while mixing until the mixture is light and fluffy. This will help make the cookies soft and delicious.

Once the butter and sugar are combined, pour in the vanilla extract and mix it well into the batter. Then, slowly add the all-purpose flour and salt, mixing on low speed until the flour is fully combined. Be careful not to mix too much, as this can make the cookies tough instead of soft.

Now that the dough is ready, gently mix in the finely chopped nuts using a spatula or wooden spoon. Make sure the nuts are spread out evenly in the dough. This will add a nice crunch to each cookie and improve the texture and flavor.

Now, take small pieces of dough and roll them into balls about an inch wide. Put them on a plate or tray and cover with plastic wrap. Place the dough balls in the fridge to cool for about 30 minutes. Chilling the dough helps the cookies keep their shape while baking.

Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone baking mat. Carefully arrange the chilled dough balls on the prepared baking sheet and leave some space between each ball to allow for expansion during baking.

Put the baking sheet in the preheated oven and bake the cookies for about 12-15 minutes, or until the bottoms are light golden. Watch closely so they don’t bake too long; you want the cookies to stay soft and buttery.

After taking the cookies out of the oven, let them cool a bit on the baking sheet. While they are still warm, roll each cookie in a bowl of powdered sugar until covered. Then, let them cool completely on a wire rack.