Sour Cream Apple Pie

I can not take credit for this recipe, I found it on a blog, and here it is in all it's glory.

Sour Cream Apple Pie

Topping

3 tablespoons unsalted butter, softened
1/4 c. plus 2 tablespoons sugar
1 t. cinnamon
2 tablespoons flour

Filling

1 1/3 c. sour cream
2/3 c. sugar
1/4 teaspoon salt
2 teaspoons vanilla
2 large eggs
3 tablespoons all-purpose flour
4 or 5 large Granny Smith apples, peeled, cored, and thinly sliced

Pie crust (you can make your own, or use a pre-made one from the refrigerator section of the grocery store — I always do) fitted into a deep-dish 9" or 10" pie plate and chilled

To make the topping, in a bowl blend the butter, sugar, cinnamon, and flour until the mixture is combined well. Cover and chill the topping.

To make the filling, whisk together the sour cream, sugar, salt, vanilla, eggs, and flour until the mixture is smooth. Add the peeled, cored, and thinly sliced apples and stir the filling and apples together.

Spoon the filling into the chilled shell and crumble the topping evenly over it. Bake the pie on a baking sheet in the middle of a pre-heated 350-degree oven, 1 to 1 1/4 hours. (You might need to put a bit of tinfoil on top of the pie during the last 15 minutes to prevent the top from burning.) Transfer it to a rack and let it cool completely.