Prepare my pie crust recipe through step 5.

In a large bowl, stir the peach chunks, brown sugar, flour, lemon juice, and cinnamon together until thoroughly combined. Set filling aside as the oven preheats.

Preheat oven to 400°F (204°C).

On a floured work surface, roll out one of the discs of chilled dough (if you made the entire pie dough recipe, you can freeze the other half of the dough at this time). Turn the dough about a quarter turn after every few rolls until you have a circle 12 inches in diameter. Carefully place the dough into a 9-inch pie dish. Tuck it in with your fingers, making sure it is smooth. Spoon the peach filling into the crust, leaving any liquid behind in the bowl—you don’t want all that in the pie. Use a small paring knife to trim excess dough off the edges. Crimp or flute the pie crust edges.

In a medium bowl, combine the brown sugar, cinnamon, and flour. Stir in the butter and walnuts. The crumble topping will be thick and crumbly. Sprinkle over peaches.

Place the pie onto a large baking sheet and bake for 20 minutes. Keeping the pie in the oven, turn the temperature down to 375°F (190°C) and bake for an additional 30-35 minutes or until peach juices are bubbling on the sides and the top is lightly browned. After the first 20 minutes of bake time, I place a pie crust shield on top of the pie to prevent the edges from browning too quickly.

Allow the pie to cool for 3 full hours at room temperature before serving. This time allows the filling to thicken up; I actually place it in the refrigerator during this time so the filling is super sturdy. Serve with vanilla ice cream if desired. Cover pie leftovers tightly and store in the refrigerator for up to 5 days.