Marbled Cookies

Here's the cookie recipe that had driven me to giggle-fits a couple days ago. Yummy!

Cream:
.5 c butter
.5 c brown sugar
.5 c white sugar

Add:
1 egg
.75 c sour cream
1 t. vanilla

Mix in:
.5 t. salt
.5 t. baking powder
2 c unbleached flour

Melt:
1 c semi-sweet chocolate (choc. chips are fine)
*melt in microwave, stirring frequently (Watch out! I severely burnt it the first time!) or in double boiler 'til mostly melted

Cool chocolate slightly and pour over batter. Lightly fold in chocolate. Do not mix completely, just until a swirled, marbleized pattern is created. Bake 20-22 minutes at 300 degrees. Do not brown.