Micx the sugars together

 Beat butter and sugars until fluffy. With an electric mixer, on medium speed, for about two minutes.

Whisk two cups flour, baking powder, and salt together in a medium bowl.

Add eggs, one at a time, beating until mixed up. Beat half of the flour, until just incorporated, add half of the milk. Add in half of the remaining mixture of flour, then the remaining milk. Toss the blueberries in the end.

Spread batter in prepared pan. Preheat oven at 350 degrees and bake for 35-40 minutes.

And enjoy this delicious blueberry fluff cake.