NH Maple Butter Tart

Ingredients

• 1/3 cup Fuller’s Sugarhouse pure maple syrup
• 2/3 cup packed dark brown sugar
• 1/4 teaspoon coarse kosher salt
• 1/2 stick (1/4 cup) unsalted butter, very soft
• 1 teaspoon pure vanilla extract
• 1 large egg
• 1 1/2 cup all-purpose flour
• 1/2 cup confectioners’ sugar
• 1 teaspoon kosher salt
• 1 stick cold unsalted butter, cubed