Grease a 10 inch tube pan or bundt pan with 2 Tablespoons butter then sprinkle pan with 1/4 cup sugar
Cream remaining 1 cup butter, gradually add remaining 2 cups sugar until fully combined and butter sugar mixture is a lighter color, whipped and smooth
Add eggs one at a time beating well after each one
Add vanilla and combine
Combine 2 3/4 cup flour, baking powder and salt in a bowl and gradually add to cream mixture beating well until blended
Dredge blueberries in remaining 1/4 cup flour and stir by hand into cake batter.
Pour batter into tube or bundt pan and bake in a 325 degree oven for 1 hour or until toothpick inserted in cake comes out clean.