2 ¼cupswalnut pieces, coarsely ground in a food processor to form a meal. You can grind them longer to make them finer but be careful not to overprocess them because they can turn into walnut butter.
1cuppowdered sugar
Instructions
In a large bowl, beat the egg and butter together with an electric mixer on medium speed. Add sugar and cinnamon and beat well to combine.
In a small bowl, whisk together the flour and baking powder. Beat into the batter and then add the ground walnuts. Mix on low speed until smooth. Place bowl in the fridge and chill for 30 minutes.
When ready to bake, preheat oven to 350° F and line two baking sheets with parchment paper. Place powdered sugar in a bowl.
Remove the dough from the fridge and roll into 1-inch balls. Roll in sugar and place on baking sheet 1- inch apart. Place in the oven and bake for four minutes; then rotate sheets and bake cookies until they are golden, firm at the edges, and slighly cracked on top, another 3-5 minutes. Remove from oven, let cool on the sheet, and dust with more powdered sugar before serving.
Store in an airtight container at room temperature for 5 days.