Whisk together the sugar and flour in a bowl
Add eggs, sour cream, and vanilla to the mixture and mix until smooth
Spread the blueberries evenly in your unbaked pie crust
Pour the sour cream mixture over the blueberries and smooth it out
Combine brown sugar, white sugar, nutmeg, and flour in a bowl
Stir in melted butter until crumbs form
Sprinkle the crumb topping evenly over the pie
Bake at 350°F (175°C) for 55 minutes, or until the top is golden and the center is set
Let cool completely before slicing
