In a large mixing bowl, beat together butter and sugar until creamy. Add egg and lemon juice; beat well.
In seperate bowl, combine flour, baking powder, baking soda and salt. Gradually beat flour mixture into creamed mixture. Beat until well-mixed. Dough will be soft!
Divide dough in half. Wrap each half in wax paper then plastic wrap and chill at least 2 hours in FREEZER.
After dough has chilled, preheat oven to 375.
Roll dough on to lightly floured surface to 1/8"-1/4" thickness. Cut out shapes with cookie cutters and place on ungreased cookie sheets.
Bake @ 375 for 8-10 minutes or until edges slightly golden brown.
Makes about 4 dozen, depending on size and shape of cutters used.