With a stand mixer or hand mixer, beat cream cheese, butter and sugars until light and fluffy, scraping down the sides as needed. About 5 minutes.
Add egg yolk and extract and mix for one or two minute.
Add in flour, in three additions. Mix on low speed, just until just combined. Don't over mix the dough.
Preheat oven to 350F and line sheet pans with parchment paper.
With a small cookie scoop (about 1 ½ tablespoon) portion dough and roll into a ball. Place on sheet pan.
Lightly press with your thumb, one measuring teaspoon, or with index finger for heart shape, in the center of each round.
Optional but recommended : Fill the strawberry jam into a plastic zipper bag and snip the end. Makes it easier to fill.
Fill each indentation with a ½-1 teaspoon of jam.
Place sheet pan in the oven to bake for 9 to 10 minutes. Bake until just set, try not to over bake. The cookies should be soft.
Leave the cookies to cool for 5 minutes on the hot sheet pan, the cookies will continue to cook. Then transfer to a cooling rack to fully cool. Enjoy.