1.Preheat oven to 350 degrees. Grease 10"x 10" metal baking pan and dust with flour. In a bowl mix flour, baking soda and baking powder. Shift three times.
2. In a large bowl mix sugar and butter, high speed until creamy. About ten minutes. Add one egg a time to the mixture, beat for about 6 to 8 minutes. Reduce the speed to low, add one tablespoon flour with one tablespoon milk at a time until all add to the mixture. Add vanilla extract and butter extract and beat few more minute. Do not forget to frequently scrap bowl with rubber spatula.
3. Pour the batter into pan place it in middle rack and bake 45 to 50 minutes. Insert toothpick in center of cake comes out clean. Cool the cake in pan few minute, then invert onto wire rake cool it completely before it icing the way you want.
* It is very important that every ingredient is in room temperature