01 -
Line two 13x9 baking sheets with parchment paper. Whisk together flour, cornstarch, and salt in a medium bowl.
02 -
Cream butter and sugars until light and creamy. Mix in egg yolk, vanilla, and almond extract. Gradually add dry ingredients.
03 -
Form 1 tablespoon dough balls, place on sheets 2 inches apart. Press heart shape into tops with pinky finger. Freeze 30 minutes or refrigerate 1 hour.
04 -
Heat jam until runny. Fill heart indents with about 1/2 teaspoon jam each.
05 -
Bake at 375°F for 10-12 minutes until edges are golden brown. Cool 5 minutes on sheet, then transfer to cooling rack.