Place chopped almonds on a baking sheet and toast for 3 to 5 minutes in preheated oven. Remove from oven and set aside to cool.
Once the nuts are cooled, beat together the butter, 1/2 cup powdered sugar, and vanilla in a large mixing bowl.
Add flour to butter mixture in two additions, mixing until just combined after each addition. Stir in the toasted almonds by hand.
Use a small cookie scoop to portion cookie dough and then roll dough into 1-inch balls. Place cookies on a silicone mat lined baking sheet. Bake for 14 to 16 minutes, or until the bottom edges of the cookies just begin to brown.
Remove cookies from oven and let cool for 5 minutes. Roll warm cookies in the remaining 1/2 cup powdered sugar, and place on a wire rack to cool completely.
Notes
You can also make this recipe without the nuts and it will be completely delicious! Without nuts, this recipe makes 24-28 cookies.