My Grandmother's Ultimate Bake Brown Sugar Cinnamon

Ingredients

• 2 ½ cups (300g) all-purpose flour
• 1 tablespoon granulated sugar
• ½ teaspoon salt
• 1 cup (226g) unsalted butter, cold and cubed
• 6–8 tablespoons (90-120ml) cold water
• 1 cup (200g) brown sugar, packed
• 2 teaspoons ground cinnamon
• ½ teaspoon vanilla extract
• 1 tablespoon all-purpose flour
• 1 cup (120g) powdered sugar
• 1-2 tablespoons milk (or more for desired consistency)
• 1 teaspoon vanilla extract
• Optional: Sprinkles for decoration