Directions

1. 1

   Preheat your oven to 350°F and lightly grease a 9×13-inch baking pan with butter or cooking spray.

2. 2

   In a large mixing bowl, beat together the softened butter and sugar until light and fluffy, about 2–3 minutes.

3. 3

   Add the egg yolks, lemon zest, and sour cream to the butter mixture and beat until well combined and smooth.

4. 4

   In a separate medium bowl, whisk together the flour and ground walnuts to distribute them evenly.

5. 5

   Gently fold the dry ingredients into the wet ingredients until a soft, unified dough forms. Do not overmix.

6. 6

   Press approximately two-thirds of the dough evenly into the bottom of the prepared baking pan, pressing slightly up the sides to create a shallow border that will contain the jam.

7. 7

   Spread the triple berry fruit spread evenly over the base layer of dough, leaving a small margin from the edges.

8. 8

   Roll out the remaining one-third of dough between two sheets of parchment paper to an even thickness, then cut into strips approximately ½ to 1 inch wide.

9. 9

   Arrange the dough strips in a lattice pattern over the fruit filling, creating a crisscross design.

10. 10

    Bake for 45 minutes, until the lattice top is golden brown and a toothpick inserted into the dough portion comes out clean.

11. 11

    Remove from the oven and allow the bars to cool completely in the pan before cutting and serving.