Preheat the oven to 350F(180C)
Line a springform or baking dish with parchment paper and use soft butter or oil to grease the sides and bottom. Set aside.
Wash and dry the blueberries. Add 1 t flour and mix it in. This will prevent them from sinking into the bottom. Set aside.
In the bowl of a stand mixer or regular bowl beat the soft butter and sugar for a minute. Then add the lemon zest, eggs, yogurt, baking powder, and salt. Beat again till creamy. Gradually start adding the flour, a tablespoon at a time, and beat on medium sped, till no dry patches remain. Don't over mix. Last, gently fold in the blueberries.
Transfer the batter to the baking dish. Spread it on an even layer add more strawberries if you'd like and sprinkle sugar on top.
Bake for 30-35 minutes or till golden on top and toothpick comes out clean.
Take out of the oven and let it rest in the springform for a few minutes, then transfer to a cooling rack or a plate. Enjoy!