In a large bowl, beat the butter and sugars until light and fluffy—about 4 minutes.
Add the egg and vanilla and mix well.
In a separate bowl, mix the flour, baking powder, and salt and add to the butter mixture.
Mix well until no pockets of flour are left. Dough will be very stiff. You may need to stir it by hand if the mixer can’t handle it.
Stir in the pecans at the end.
Divide the dough in half and shape into a log on a piece of plastc wrap.
Twist the ends to seal and refrigerate the rolls for two hours or up to 5 days. You can also transfer the dough to the freezer and freeze for up to a month.
When you’re ready to bake slice off ¼” thick slices and bake on ungreased cookie sheets at 350 degrees for 10 to 12 minutes.
Notes
Dough needs to chill at least 2 hours before slicing or bake from frozen.