Fishmarket Apple Pie

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1 premade folded pie crust

2 1/2 pounds McIntosh apples, peeled, cored and sliced

1 egg

1 1/2 cup sour cream

1 cup sugar

1/4 cup flour

2 teaspoons vanilla

1/2 teaspoon salt

Topping:

1/2 cup butter

1/2 cup flour

1/3 cup sugar

1/3 cup brown sugar

3 teaspoons cinnamon

1/4 teaspoon salt

1 cup chopped walnuts