Preheat your oven to 350°F (175°C).

In a bowl, whisk together flour, baking soda, and salt.

In a separate large bowl, cream the softened butter, brown sugar, and granulated sugar together until fluffy.

Add the eggs and vanilla extract, mixing well.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

For chocolate lava cookies, fold in chocolate chips.

For cookies and cream milkshake cookies, fold in crushed Oreos.

For lemon cookies, fold in lemon zest and juice.

Scoop dough onto a baking sheet lined with parchment paper, spacing them out.

Bake for 10-12 minutes or until edges are lightly golden.

Cool on a wire rack before serving.