Prepare the pie crust if you are making homemade pie crust. Refrigerate for several hours or overnight. On a lightly floured work surface, roll out the bottom crust slightly larger in diameter than your baking dish. Gently place the pie crust into the pan lightly, using your fingers. Use kitchen shears to trim the edges of the crust, to about ¾-inch past the pan rim.
Use a large spoon or ladle to scoop the cherry pie filling into the pie crust. Discard the remaining lemon juice.
Trim the edges of pie crust with kitchen shears and roll under the crust. Crimp with your fingers or press with a fork.
Sprinkle the crumb topping over the cherry pie filling.
Brush the pie crust edges with an egg wash.
Place the pie on a half sheet pan lined with parchment paper. This will help catch any juices that run over the edges of the pie plate.
Place in a preheated 400 degree F oven for 1 hour. The crust will be golden brown and the filling bubbling up around edges of the crust.
Part way through baking, cover the pie with a piece of aluminum foil. Cut a hole in the center prior to placing over the pie. This will help the pie continue cooking, but let steam escape so your pie crust does not become soggy. This will prevent the edges of the pie crust from becoming too brown.
Let cool for 2-3 hours before slicing. This will allow the pie filling to set.