Cream butter and sugar.
Blend in the beaten eggs and cornmeal.
Sift together the flour, baking powder and salt; set aside.
Add 1/3 of the flour. Then mix in 1/2 cup of the milk. Repeat ending with the flour.
Dust the blueberries with about a tablespoon of the reserved flour. Gently fold them into the batter.
Place batter in an 8'x 8" square pan either sprayed with non-stick spray or lined with non-stick foil.
Bake at 375 degrees for about 40 minutes.