Apricot Walnut Thumb print Cookies

So my neighbor brought over cookies for us the other night and while Chris and I are VERY particular (especially Chris) about our cookies, he LOVED these Thumb print ones she had made. So I had another conversation with myself thinking "Now I know you've JUST started being able to bake edible cookies but You can SOO make these!!" So I did! I used Walnuts, just because i wanted to and i like how they taste and I used an Apricot Jam because that was what was in the fridge~ And you know what, he LOVED THEM! YEA!
I got this recipe from Epicurious but I changed it around a bit... mostly the nut choice and how i used the nut~

Ingredients
1 c Walnuts
2/3 c packed brown sugar (i used 3/4 b/c i read it wrong and i like sugar and it was great!)
1 1/3 all purpose flour
1/2 tsp salt
10 tbsp unsalted butter, cut into 10 pieces, room temp.
1 large egg yoke
1/2 tsp vanilla

Preserves (I used Apricot)

Directions
Preheat oven to 325
Throw your walnuts in a food processor and shred them into little itty bitty pieces
Blend your flour, sugar and salt. Add butter and mix until it resembles coarse crumbs.
Whisk egg yolk and vanilla in a small bowl then add to your crumbles
Moist clumps should form
Knead briefly to bind dough.
Form into 1 1/4" balls
Dip into a cup of water and roll in the walnut pieces until coated (you might have to do a little pushing)
Place on cookie sheet (ungreased) and using your thumb, make a deep indentation in center of ball.
Bake about 15mins, until firm to touch and golden on bottom (Yeah i couldn't SEE the bottom either so i did the touch test and guessed)
When you remove from the oven immediately use the back of a small spoon to press in the indentation, since it is mostly gone now.
Transfer to a rack to cool completely
and put a large dollop of preserves in the middle!
Now sit back and enjoy!