Bake the cookie base

• Line a baking tray with parchment paper.
• Press the lemon sugar cookie dough into an even layer on the tray.
• Bake until golden and set, then let cool completely.

Make the frosting

• Beat the softened salted butter in a bowl.
• Add the powdered sugar, vanilla and milk and beat until smooth and fluffy.

Assemble the fruit pizza

• Spread the frosting over the cooled cookie base.
• Arrange the sliced strawberries and blueberries on top.