Preheat oven to 300 degrees F (150 degrees C).

Combine butter, honey, and vanilla extract in a bowl; beat with an electric mixer until creamy. Mix in flour 1/2 cup at a time. Stir walnuts into the dough.

Form dough into 1-inch balls. Arrange on an ungreased baking sheet.

Bake in the preheated oven until very light golden, 30 to 45 minutes. Cool briefly, about 5 minutes.

Pour confectioner's sugar into a shallow bowl. Roll warm cookies in confectioners' sugar to coat.