Prepare my pie crust through step 5.

Whisk the brown sugar, flour, and cinnamon together in a medium bowl. Cut in the butter using a pastry cutter or forks until the mixture is crumbly. Stir in the oats. Refrigerate until ready to use.

After the pie dough chills, preheat oven to 400°F (204°C). Place a baking sheet on the bottom oven rack, to catch any juices that may spill over the sides of the pie.

Roll out the chilled pie dough onto a lightly floured surface. Remember, when rolling out the pie dough, always use gentle force with your rolling pin. Start from the center and work your way out in all directions, rotating the dough with your hands as you go. Roll it out into a circle 12 inches in diameter. Carefully place the dough in a 9-inch pie dish. Tuck it in with your fingers, making sure it’s smooth. For a beautiful edge, fold the overhanging dough back over the edge and use your hands to mold the edge into a nice thick rim around the pie. Crimp the edges with a fork or use your fingers to flute the edges. For visuals and a video of this, see how to crimp and flute pie crust. Brush the edges with egg wash. Refrigerate for at least 10 minutes as you prepare the pie filling.

In a large bowl, stir the apple slices, cranberries, brown sugar, flour, orange zest, cinnamon, allspice, and nutmeg together until thoroughly combined. Spoon the filling into the chilled crust. Sprinkle the cold crumble topping all over the filling.

Bake for 20 minutes. Then, keeping the pie in the oven, reduce the oven temperature to 375°F (190°C). Place a pie crust shield (see Notes for homemade shield) on the edges to prevent them from over-browning. Continue baking the pie until the filling is bubbling around the edges, 35–40 more minutes. If you want to be precise, the internal temperature of the filling taken with an instant-read thermometer should be around 200°F (93°C) when done. Tip: If needed towards the end of bake time, remove the pie crust shield and tent an entire piece of foil on top of the pie if the top looks like it’s getting too brown.

Remove pie from the oven, place on a cooling rack, and cool for at least 3 hours before slicing and serving. Filling will be too juicy if the pie is warm when you slice it. Serve with vanilla ice cream, if desired.

​​Cover and store leftover pie at room temperature for up to 1 day or in the refrigerator for up to 5 days.