Preheat the oven to 350°F and line a baking sheet with parchment paper. Set aside.

In a large bowl, beat the softened butter and sugar together on medium-high speed for about 3 minutes, until light and creamy. Mix in the egg yolks, almond extract, and salt until fully combined.

Add the flour gradually, mixing on low speed just until a soft dough forms. Put on disposable gloves if desired and gently bring the dough together with your hands.

Use a 1½-tablespoon cookie scoop to portion the dough. Roll each portion into a smooth ball and place on the prepared baking sheet, spacing cookies about 2 inches apart. Press your fingertip into the center of each ball, then press again at an angle to create a heart shape.

Spoon a small amount of jam into each heart indentation.

Bake for 13-15 minutes, until the bottoms are lightly golden and the cookies are set.

Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.