01 -
Put parchment paper on two 13×9 trays so cleanup will be simple.
02 -
Mix the cornstarch, salt, and flour in a medium bowl, then keep it aside for later.
03 -
In a large bowl, use a hand or stand mixer to whip the soft butter, granulated sugar, and brown sugar together. Start slow, then bump up the speed to medium-high for a couple minutes until fluffy and pale.
04 -
Scrape the bowl down, then mix in the almond extract, vanilla extract, and egg yolk until it's all nicely blended.
05 -
Lower the mixer speed, and slowly add the dry mix to the wet. Scrape the sides occasionally so there aren't any dry spots left.
06 -
Grab a tablespoon-sized piece of dough and roll it in your hands to form smooth balls. Space them 2 inches apart on your prepped trays.
07 -
Press a heart imprint into each dough ball gently, using your pinky or a spoon-back. Pop the trays in the freezer for 30 minutes, or the fridge for an hour.
08 -
Set your oven to 375°F (190°C) and let it preheat while cookies chill.
09 -
Microwave your jam for 10–15 seconds until it's slightly runny. Use a small spoon or 1/4 teaspoon to add about 1/2 teaspoon of jam into each indent.
10 -
Bake the cookies for 10–12 minutes. Once the edges just turn golden, they're ready.
11 -
Leave your cookies on the trays for 5 minutes, then move them to a rack to cool completely.