Preheat oven to 350 F. Grease and flour muffin pan or better use paper cups for muffins. Sift flour, baking powder and salt together. Using a mixer, cream butter and sugar until light and fluffy. Add eggs and beat well. Add milk and flour mixture. Beat until combined, be careful to not overbeat the batter. Stir in blueberries. Fill muffin cups 2/3 full. Bake for 30 to 35 minutes.