Combine the first four ingredients in a large bowl.
Turn out onto a work surface dusted with confectioner’s (powdered) sugar.
Knead until smooth, adding more powdered sugar as needed, until a pliable but not sticky dough forms.
Divide into 3 equal portions.
Roll out 1 portion on the surface dusted with powdered sugar, to 5×8 inch rectangle, 1/8 inch thick.
Spread about 1 ½ tablespoons peanut butter evenly over the top.
Roll up, jelly-roll style, from long side. Wrap with plastic wrap. Chill.
Repeat with remaining portions.
Cut each roll in to ¼ inch slices.