Jammin' Shortbread

Directions

1. Preheat oven to 300ºF.
2. Lightly butter a 9x13-inch baking pan or quarter sheet pan.
3. In a large bowl, cream together the butter and sugar. Add in the salt and vanilla and continue to mix until well combined. Stir in the flours until the dough is cohesive.
4. Press the dough evenly into the prepared pan, creating a smooth surface. Using a fork, prick the dough about 20 times, keeping the marks uniform and being sure to cover all areas of the dough.
5. Bake the shortbread for 35-40 minutes, or until golden around the edges. Remove the pan from the oven; loosen the edges of from the pan using a dull knife or offset spatula. Cool the pan for about 5 minutes.
6. Working with the cookies while they're still warm, carefully turn the entire pan of cookies out onto a clean, flat surface. With the topside up, trim away about 1/4 inch around the border of the cookies. Crumble the scraps into a small bowl and set aside.
7. Cut the slab of cookies into 24 squares, about 2 inches by 2 inches each.
8. Allow squares to cool. Spread a thick layer of jam onto each cookie, and then distribute the crumbs evenly over them.
9. Store in an airtight container in a single layer or with a piece of wax or parchment paper between layers.