Preheat your oven to 180°C (350°F).
Grease a 9-inch cake pan, or line a square baking dish with parchment paper --- then set aside.
Remove a 1/4 cup of blueberries (for later), then combine the rest with a 1/3 cup of flour.
Sift the remaining flour with salt and baking powder; put aside.
Using a separate bowl, mix the sugar and butter until creamy.
Add the egg and vanilla extract and mix --- then combine the yogurt and lemon zest.
Add the strained, dry ingredients from earlier and mix until just combined.
Fold the blueberries with flour --- try not to smash them.
Transfer your blueberry yogurt cake batter to the lined baking dish and use a spatula to even the top.
Sprinkle 1 & 1/2 tablespoons of sugar, then scatter the remaining blueberries randomly.
Place it in the lower part of your oven for 45 to 50 minutes or until it turns golden.
Set aside to cool, sprinkle with powdered sugar, and serve and enjoy!