1.   Combine butter, semisweet chocolate chips and unsweetened chocolate in a heavy medium saucepan.

2.   For her part, Sills was just happy having an audience so enthusiastic about learning to make the lighter-than-air white cookies studded with semisweet chocolate chips.

3.   If there is any space left after adding the last ingredient, add more semisweet chocolate chips to fill the jar.

4.   Melt semisweet chocolate chips and a little solid vegetable shortening in a double boiler over simmering water until smooth.

5.   Then he lets fly with the semisweet chips.

6.   We chose to compare the various brands of the standard semisweet chocolate chip.