Preheat the oven to 400°F. Place a sheet of parchment paper or a silicone mat on a baking sheet to catch any spills.
Arrange the crust in a pie pan. (See the note on parbaking below.)
In a mixing bowl, combine the sour cream, flour, sugar, salt, vanilla, and egg. Beat for 3-5 minutes to thoroughly combine.
Fold in the blueberries.
Pour into the crust. Add a pie crust baking shield or aluminum foil ring to protect the crust edges. Bake for 25 minutes.
Topping
In an electric chopper, add the flour, butter, and sugar and process until combined and crumbly.
After the pie bakes for 25 minutes, remove it from the oven and sprinkle on the topping; then add the pecans.
Bake for 10 additional minutes on the middle rack of the oven. If the crust under the pie shield is pale, remove it for the last 10 minutes of baking.
Notes
Baking Pan
Pie crusts achieve a better golden brown color in aluminum pans compared to glass or stone pans. However, you can substitute a 9-inch glass dish.
Parbaking the Crust to Prevent Sogginess
Consider parbaking the crust at 425°F for 15-20 minutes, until it's lightly browned. This technique helps create a barrier that prevents excess moisture from the blueberries from making the crust soggy. Keep an eye on the crust, and remove it sooner if it browns too quickly. Additionally, if the edges are thin, using a pie shield can help protect them from over-browning during baking.
Streusel Topping
You can combine the streusel topping with a pastry blender or by hand if you don't have an electric chopper or food processor.
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