Prep: 20 min
Makes: 32 bars
Preheat oven to 350ºF.
Blend butter, sugar and vanilla in a mixer on low speed for 1 minute. Increase speed to medium and continue creaming for 1 to 2 minutes. Add flour on low speed and beat until thoroughly combined.
Grease a 13 x 9-inch pan. Spread shortbread in pan; patting in place with hands.
Bake for 15 to 20 minutes, or until shortbread is golden brown.
For vanilla glaze:
Combine powdered sugar, vanilla and milk in a small bowl and mix until well blended. Pour over warm shortbread.
Cool shortbread for a minimum of 2 hours. Cut into 32 small bars.
Tip: Immediately after spreading glaze, sprinkle with colored sugar or holiday sprinkles for a festive look.