These sourdough thumbprint cookies are a buttery shortbread cookie filled with your favorite jam. They are easy to make and sure to be a hit during the holidays.
In the bowl of a stand mixer, cream together the butter and sugar on medium speed.
Add the egg yolk, sourdough discard, vanilla, and salt and mix until well combined.
Slowly add the flour and pecans on low speed until just fully combined.
Scoop the cookie dough into approximate 1 tablespoon (about 1 inch) cookie dough balls.
Place each cookie dough ball on a large baking sheet lined with parchment paper approximately 2 inches apart.
Use your thumb or the back of a small spoon to make an indent in the top of each cookie.
Use a small spoon to fill each indent with approximately ½ teaspoon (or more if you desire) of jam. If the jam is hard to work with, place it in a small bowl and microwave for 10-15 seconds to soften it.
Bake the cookies for 18-20 minutes or until the edges appear slightly golden.