Pre-heat oven to 350°F. Line 2 baking sheets with parchment paper.
Grab 3 small bowls and 3 spoons and add a bit of jam (about 2 Tbsp) to each bowl. Stir the jam to loosen it up a bit, then set aside.
In a mixing bowl beat butter and sugar until light and fluffy.
Add vanilla and eggs. Mix well.
Gradually add flour and baking powder. Mix well.
Lightly sprinkle flour on countertop.
Divide the dough into four equal parts.
Roll the dough into a long rope about 15 inches long and place it on a baking sheet lined with parchment paper. I usually place two ropes per baking sheet as they will spread some.
Gently make an indentation halfway through the dough using the tip of a wooden spoon or other utensil.
Add jam down the center of each rope, being careful not to over fill the indentation.
Bake 15-20 min until lightly golden. The jam may run a bit, this is normal.
Once cooked, remove and cool slightly. Then cut on the diagnol while still a bit warm. Let cool completely.
Store in an airtight container 4-5 days.