Make the Cookie Dough
In a large bowl, cream together the butter, cream cheese, and sugar until smooth and fluffy. This step is important — fully softened cream cheese ensures a smooth dough with no lumps.
Add the egg and vanilla extract and mix until combined.
Add Dry Ingredients
Slowly mix in the flour, baking powder, and salt. Mix just until combined. Overmixing can make the cookies dense instead of soft.
Add the Strawberry Swirl
Scoop small spoonfuls of strawberry jam and gently fold them into the dough. Do not fully mix — you want visible strawberry swirls, similar to Strawberry Cake Cookies Recipe styles where the fruit stays distinct.
Chill the Dough
Chill the dough for at least 30 minutes. This helps the cookies hold their shape and enhances flavor.
Bake
Scoop dough onto a lined baking sheet and bake until the edges are set and the centers are just slightly soft. Let cool on the pan for a few minutes before transferring to a rack.