Thumbprint Cookies (Print Version)

# Ingredients:

01 - 1/3 cup (105g) jam or preserves.
02 - 2 teaspoons cornstarch.
03 - 1/2 teaspoon salt.
04 - 1/3 cup (70g) sugar.
05 - 3/4 teaspoon vanilla extract.
06 - 1/2 cup sugar for rolling (if desired).
07 - 1 large egg yolk.
08 - 1/3 cup (70g) tightly packed light brown sugar.
09 - 2 1/4 cup (280g) all-purpose flour.
10 - 1 cup (226g) unsalted butter, softened and at room temperature.

# Instructions:

01 - In a large bowl (using a stand or hand mixer), whip the butter until it’s light and smooth.
02 - Toss in the sugars and beat together on medium-high for 30 to 60 seconds. Make sure to scrape the sides of the bowl so everything blends well.
03 - Mix in the vanilla extract and egg yolk, beating till fully incorporated.
04 - In another bowl, stir the flour, salt, and cornstarch together. Slowly combine this dry mix with your wet ingredients. The dough will look crumbly—but that’s okay!
05 - Roll the dough into 1 Tablespoon-sized balls, making them smooth. Coat them in sugar if you want, then use your thumb or a spoon to make a dent in the middle.
06 - Pop the cookie dough into the freezer and leave it there for half an hour.
07 - Preheat your oven to 375F (190C). Warm up the jam briefly, so it’s easier to work with. Put a small spoonful into the dent of each cookie.
08 - Line a baking sheet with parchment and place the cookies 2 inches apart. Cook at 375F for about 11 minutes, or until the edges just start to brown.

# Notes:

01 - Avoid cracks by rolling the dough into smooth balls.
02 - Feel free to pick any jam flavor you like.
03 - Cool the cookies fully right on the baking tray.