Cream the room-temperature butter and sugar for 3 to 4 minutes until light in colour and fluffy.
½ cup Butter, ½ cup Sugar
Add in the egg yolk and both extracts and mix.
1 Egg yolk, 1 teaspoon Vanilla extract, ¼ teaspoon Almond extract
Sift together the all-purpose flour, baking powder, and salt. Add them to the butter mixture in two batches and fold them with a rubber spatula. Do not overmix the cookie dough, resulting in a tough cookie.
1¼ cup All-purpose flour, ¼ teaspoon Baking powder, ¼ teaspoon Salt
Line two baking sheets with parchment paper. Use an ice cream scoop to make small balls of dough the size of a walnut in the shell or an inch. Place the cookie ball on the baking sheet and use a round half teaspoon to make a small well in the center of the cookies. Be gentle with this step to avoid breaking the cookie ball.
Leave about two inches of gap between the balls and chill them for 30 minutes. Chilling the cookie dough prevents the cookies from spreading too much.
In the meantime, preheat the oven to 350℉.
I want to fill the VanillaThumbprint Cookies with jam after baking to keep the jam fresh. Bake the cookies for 10-12 minutes or until the edges look set and slightly golden. Immediately after bringing the cookies out of the oven, use a larger round measuring spoon to make their center deeper. Let the cookies cool thoroughly before filling them.
I like Seedless Raspberry and Apricot jams, but you can use any other jam. Place about one teaspoon of the jam in the well of the cookies. ¼ cup Raspberry jam, ¼ cup Apricot jam