Step 1: Prepare the Blueberry Swirl

1. In a small saucepan over medium heat, combine the blueberries, sugar, and lemon juice.
2. Cook for 5-7 minutes, stirring occasionally, until the blueberries break down and the mixture thickens.
3. Remove from heat and let cool completely.

Step 2: Make the Cheesecake Swirl

1. In a small bowl, beat the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy. Set aside.

Step 3: Prepare the Cookie Dough

1. In a medium bowl, whisk together the flour, baking soda, and salt.
2. In a large mixing bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy (about 2 minutes).
3. Add the egg and vanilla extract, mixing until fully incorporated.
4. Gradually add the dry ingredients, mixing just until combined.

Step 4: Swirl in the Fillings

1. Gently fold the cheesecake mixture and blueberry swirl into the cookie dough. Use a spatula to create ribbons of filling without fully mixing.

Step 5: Bake the Cookies

1. Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. Scoop tablespoon-sized portions of dough onto the baking sheet, spacing them about 2 inches apart.
3. Bake for 10-12 minutes, or until the edges are golden brown.
4. Allow cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack.