Cinnamon Swirl Apple Slab Pie Recipe

Ingredients

• 3 tablespoons all purpose flour plus more for dusting
• 2 recipes Pate Brisee (butter based crust)
• 4 tablespoons unsalted butter, room temp, plus 2 tablespoons cold cut into small cubes
• 1/2 cup packed light brown sugar
• 1 teaspoon cinnamon
• 1/2 teaspoon kosher salt
• 4 pounds assorted apples (granny smith, jonagold, rome) peeled, cored, cut into 1/4" slices
• 2 tablespoons fresh lemon juice
• 6 tablespoons sugar
• 1 teaspoon vanilla
• 1 egg, slightly beaten
• Sugar or cinnamon sugar for sprinkling