Gluten-Free Apple Tart

For the Crust

• ½ cup unsalted butter room temperature
• 3 tablespoons granulated sugar
• 1 large egg
• 1 teaspoon vanilla extract
• ¼ teaspoon salt
• 1 ½ cups gluten-free flour* all-purpose flour or white whole wheat flour can be used for a non-gluten-free version

For the Crumb Topping

• 1 ½ cups gluten-free flour* all-purpose flour or white whole wheat flour can be used for a non-gluten-free version
• 1 teaspoon ground cinnamon
• ½ cup brown sugar
• ¼ cup granulated sugar
• ⅛ teaspoon salt
• ¾ cup unsalted butter cold

For the Apple Filling

• 1 tablespoon lemon juice
• 1 teaspoon vanilla extract
• ¼ cup granulated sugar
• ¼ cup brown sugar
• 2 teaspoons cornstarch
• 1 teaspoon ground cinnamon
• ⅛ teaspoon ground nutmeg
• pinch of salt
• 4 medium about 1 3/4 pounds Granny Smith apples, peeled and cut into slightly less than 1/4" slices

For Serving

• powdered sugar or vanilla ice cream
• .