Preheat oven to 375 degrees Farenheit.
Make the crust: in a small mixing bowl, whisk together flour, baking powder, cardamom and salt and set aside.
In a medium mixing bowl, beat butter and sugar together with an electric beater for about 3 minutes, until light and fluffy. Add egg and beat well.
Slowly beat in flour mixture until well combined. Dough will resemble a sticky cookie dough.
Scoop dough into a pie pan and spread over bottom and sides. If you're having trouble spreading the dough, place a piece of plastic wrap over the pan and use that to press the dough without directly touching it.
Cover the crust dough with a piece of aluminum foil and press foil in to the shape of the crust. Prick a few times with a fork. Fill crust with dry beans or pie weights.
Bake crust 10 minutes. It will still be very soft. Remove from oven and allow to cool while you make the filling.
Make the filling: in a medium mixing bowl, use an electric beater to beat together sour cream and sugar until well combined and light.
Add egg and beat well. Add vanilla, starch and lemon zest and beat until well combined. Filling will be a thick liquid consistency.
Remove pie weights from crust. Pour a thin layer of cream filling over the bottom of the crust.
Spread blueberries evenly over filling, and pour the rest of the filling over the berries.
Bake pie for 25 minutes. Filling will still appear slightly jiggly, but not liquid. It will continue to set as it cools.
Allow to cool partially at room temp, and then place in fridge to chill until fully set.
Slice and enjoy!