Preheat the oven to 180 C / 350 F and line a tray with parchment paper or Silpat.
In a large bowl, beat the softened butter and caster sugar until light and fluffy.3/4 cup Butter, softened, 3/4 cup Caster sugar
Stir in the flour. Use your hands to bring it together into a dough.2 cups All-purpose flour
You may need to add a tablespoon or two of milk or cream if the dough is dry-ish.Your dough should be soft, silky to the touch, and pliable.2-3 tbsp Milk
Scoop dough with an ice cream scoop into 20 cookies then roll the cookie dough into even-sized balls.
Combine the black and white sesame seeds in a small, shallow bowl and roll each cookie ball in the seeds.2 Tbsp White sesame seeds, 2 tbsp Black sesame seeds
Place the cookie dough balls on the prepared tray and make an indent in the center with your thumb.
Fill the indent with 1/4 -1/2 tsp raspberry jam and bake for 10-12 minutes or until the cookies are light golden brown in color. 1/4 cup Raspberry jam
Let the cookies cool on the tray for 5 minutes then transfer them to a wire-rack for cooling them completely.
Store the cooled cookies in an air-tight container, and line each layer with a piece of wax paper. Enjoy!
Video
Notes
I rolled cookie dough balls in sesame seeds for the delicious crunch and the gorgeous visual. This is, however, completely optional. The sesame seeds can be replaced with finely chopped nuts, granulated sugar, or even sparkling sugar. Or just leave the dough balls plain.
This recipe is for eggless thumbprint cookies. However, two egg yolks can be added to the cookie dough to make the cookies richer.
Avoid overbaking these cookies as they can end up dry. 10-12 minutes usually makes a perfect batch.
I have used raspberry jam for the filling, but the thumbprint cookies can be filled with just about any jam flavor you like.