Add the granulated sugar, brown sugar, flour, cinnamon, and nutmeg. Toss to combine. Transfer the apples to the pie dish, and dot with the cubed butter.
⅓ cup granulated sugar, ⅓ cup light brown sugar, ¼ cup all-purpose flour, 1 teaspoon ground cinnamon, ¼ teaspoon ground nutmeg, 3 tablespoons unsalted butter