Lavender Shortbread Cookies

1 cup flour
1/2 cup butter
1/4 cup sugar
1 tbs ground lavender
1 tsp vanilla 

Cream butter and sugar
Add vanilla
Combine flour and lavender and mix into butter
Shape into log
Refrigerate 1 hour
Slice into 1/2 inch pieces
Bake 15-18 min at 350