With mixer on lowest speed, gradually add the sifted flour mixture and enough of the remaining 1 1/4 cups flour to make a workable dough.
Chill the dough for at least 2 hours or for up to 24 hours.
When the dough is chilled, put dough onto a big piece of plastic wrap, roll into a rectangle about 1/4" thick.
Melt chocolate chips ( I used the microwave). Using a rubber spatula, spread chocolate over cookie dough rectangle.
Warm peanut butter in microwave for about 20 seconds, until it is a bit liquidy and spreadable. Spread peanut butter over chocolate.
This part is a bit tricky... roll dough up into a log shape. The dough gets tougher to roll as it warms up so try to do this part quickly. Mine obviously was not a perfect log and I kind of had to piece it together in some places... but it still tasted good!
Freeze dough for about an hour or until solid enough to cut.
Using a very sharp knife cut dough into 1/2 inch slices (I cut mine a lot thinner but wish I had made them bigger) and place on parchment paper lined cookie sheets about 1 inch apart. Bake in a preheated 400°F oven for 9 or 10 minutes or until cookies are lightly golden.
If desired, top with a drizzle of melted chocolate. Yum!