In a large bowl, beat together butter and honey.
Beat in egg and vanilla.
Sift together flour and baking powder into a medium-size bowl.
Stir with a fork to blend.
Mix flour into butter mixture just until well blended.
Cover with plastic wrap, and refrigerate until firm, about 1 hour.
Roll dough between 2 pieces of wax paper (the bottom one lightly floured), to an 11 X 11-inch square.
Remove top piece of wax paper.
Spoon jam into a small bowl, and whisk to make it spreadable.
Spread on top of dough, leaving a 1/2-inch margin at front and back but extending it all the way to both sides.
Sprinkle nuts over jam.
Using wax paper as a guide, roll dough up, jelly-roll fashion, from front to back.
Wrap with the wax paper and freeze.
Preheat oven to 350°F.
Butter a baking sheet (even if it has a nonstick surface).
Cut frozen dough into rounds 1/4 inch in thickness.
Bake on prepared baking sheet on top shelf of oven for about 15 minutes, or until lightly browned.