Step 1: Prepare the Blueberry Swirl

The blueberry swirl adds a vibrant color and fresh flavor to these cookies.

1. In a small saucepan, combine the blueberries, sugar, cornstarch, and water.
2. Cook over medium heat, stirring occasionally, until the mixture thickens. This should take about five minutes.
3. Remove from heat and mash the blueberries slightly using a fork or the back of a spoon.
4. Let the mixture cool while you prepare the other components.

Step 2: Make the Cheesecake Filling

The cheesecake filling is what gives these cookies their signature creamy center.

1. In a small bowl, beat the softened cream cheese, sugar, and vanilla extract together until smooth.
2. Set the mixture aside until you are ready to assemble the cookies.

Step 3: Prepare the Cookie Dough

The cookie dough is soft and slightly chewy, providing the perfect base for the creamy filling and fruit swirl.

1. In a large mixing bowl, cream the butter, granulated sugar, and brown sugar together until light and fluffy. This should take about two minutes.
2. Add the egg and vanilla extract, mixing until fully incorporated.
3. In a separate bowl, whisk together the flour, baking soda, and salt.
4. Gradually add the dry ingredients to the wet ingredients, stirring until a soft dough forms.

Step 4: Assemble the Cookies

Now that all the components are ready, it is time to bring everything together.

1. Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Scoop out two-tablespoon-sized portions of cookie dough and place them on the prepared baking sheet, spacing them about two inches apart.
3. Use your thumb or the back of a spoon to make a small well in the center of each dough ball.
4. Spoon a small amount of the cheesecake filling into each well.
5. Add a small dollop of the cooled blueberry swirl on top of the cheesecake filling.
6. Use a toothpick or the tip of a knife to gently swirl the cheesecake filling and blueberry mixture together, creating a marbled effect.

Step 5: Bake the Cookies

1. Bake the cookies for 12 to 15 minutes, or until the edges are set but the centers remain slightly soft.
2. Remove the cookies from the oven and let them cool on the baking sheet for five minutes.
3. Transfer the cookies to a wire rack to cool completely before serving.