For the Crumb Topping: ½ cup all-purpose flour ½ cup light brown sugar ¼ cup quick-cooking oats ¼ cup unsalted butter, at cool room temperature For the Crust: 1 cup all-purpose flour ¼ cup light brown sugar Pinch of salt ½ cup unsalted butter, at cool room temperature For the Filling: 8 ounces cream cheese, at room temperature ¼ cup + 1 tablespoon granulated sugar, divided 1 egg ½ teaspoon vanilla extract Pinch salt 2 small apples (any variety), peeled, cored and finely chopped ¼ teaspoon ground cinnamon ⅛ teaspoon ground nutmeg 1.