Slab Apple Pie

Got this Slab Apple Pie recipe from LifeasMom. It is such an easy recipe that I will definitely make it again.

Here are her instructions (italicised instructions were the modifications I made):

Pie crust:
1 cup flour
1/2 cup butter or margarine, cut into chunks
1/2 teaspoon salt
1-2 Tablespoons cold water
In medium bowl, combine flour, 1/2 cup butter and salt with a pastry blender, or two knives held together. Kids can do this with a fork if that is easier. Work these ingredients together until they form pea-sized crumbs. Quickly stir in cold water and combine until a dough forms. Pat into a pie plate, pushing the dough thin and up the sides.

Filling:
6 apples, peeled, cored, and sliced
1/2 cup sugar
1 Tablespoon lemon juice (I used orange juice when I ran out of lemon)
1 Tablespoon cinnamon

Crumble top:
1 cup flour
1/2 cup butter
1/2 cup brown sugar
1/2 cup chopped nuts
1/2 cup oatmeal (I added this and it gave a nice crunch to the crumble top)
Preheat oven to 375°. Prepare pie crust according to directions and pat it into the bottom of a 9×13 pan. In large mixing bowl, combine apple slices, sugar, lemon juice and cinnamon. Spread in an even layer over crust. In food processor, combine flour, butter, and brown sugar, pulsing until coarse crumbs are formed, or in a large mixing bowl, combine these ingredients, cutting butter into sugar and flour with a pastry blender or two knives held together. Stir in nuts. Sprinkle crumb top over apple layer.* Bake for 45 minutes to an hour or until filling bubbles. Cool completely.
If preparing ahead of time to freeze. Wrap with foil and label at the *. Then, when ready to serve, bake frozen pie at 425° for 15 minutes. Reduce heat to 375° and continue baking as directed.

Note to self:
Need a little more sugar if using lemon juice.
Remember to put sugar in the crumble crust!!