Mix with the pecan mixture and the remaining dry ingredients. Beat to blend - the dough will be moist but a bit crumbly. Knead the dough with hands, for a few seconds, just to form the more elastic dough.
Beat the butter, vanilla, and lavender with an electric mixer, until creamy and fluffy, about 3 minutes.
Combine the pecans with 1/3 cup of powdered sugar and process in a combine - you'll need the flour texture.