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Smarties Sugar Cookie Bars

Smarties Sugar Cookie Bars

Published October 13, 2026

Soft vanilla sugar cookie bars with a simple glaze, finished with tart crushed Smarties after baking for color and crunch.

Add the Smarties after baking; the heat dulls their color and they turn chalky inside the oven. Crush gently into coarse pieces rather than a fine powder for better crunch.

Keeps 4 days airtight. Cool the bars completely before glazing so the glaze doesn't slide off.

Cook time
37 min
Rating
…

Ingredients

Scale
Measurement units
  • ½ cup unsalted butter
  • ¾ cup granulated sugar
  • 1 egg
  • 2 tsp vanilla extract
  • 1 ½ cup all-purpose flour
  • 1 tsp baking powder
  • ¼ tsp salt
  • 1 cup powdered sugar
  • 2 tbsp whole milk
  • 6 Smarties

Instructions

Prep
Heat the oven to 350°F.
Line a 9-inch square pan with parchment, leaving an overhang.
Crush Smarties into coarse pieces.
Equipment: 9-inch square baking pan, parchment paper
Mix the dough
Beat unsalted butter (½ cup) with granulated sugar (¾ cup) until light and fluffy.
Beat in egg and vanilla extract (2 tsp).
Stir in all-purpose flour (1 ½ cup), baking powder (1 tsp) and salt (¼ tsp) until a soft dough forms.
Press the dough evenly into the pan.
Equipment: 9-inch square baking pan
Bake
Bake about 22 minutes, until the edges are lightly golden.
Cool completely in the pan, about 45 minutes.
Equipment: 9-inch square baking pan
Glaze and finish
Whisk together powdered sugar (1 cup) and whole milk (2 tbsp) until smooth, then spread it over the cooled bars.
Sprinkle the crushed Smarties over the glaze and press in lightly.
Lift out and cut into 16 bars.

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