CHOCOLATE CHIP BUTTER COOKIES

1 lb Butter or margarine
Powdered sugar
1/2 ts Salt
2 ts Vanilla
4 1/2 c  Flour
12 oz Semisweet chocolate pieces
 
Cream butter and 2 cups powdered sugar. Add salt, vanilla and flour. Mix to blend. Stir in chocolate pieces. Pinch off pieces of dough. Roll into 1-inch balls and flatten with fork on baking sheet. Bake at 350F 15 minutes. Sprinkle with powdered sugar while hot.