Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan and line the bottom with parchment paper.
Mix Dry Ingredients: In a bowl, whisk together flour, baking soda, and salt. Set aside.
Cream Butter & Sugars: In a large bowl, beat butter, granulated sugar, and brown sugar until light and fluffy (2-3 mins).
Add Wet Ingredients: Mix in the egg and vanilla extract until well combined.
Combine Dry & Wet: Gradually add the dry ingredients to the wet mixture, mixing until just combined. Fold in chocolate chips.
Press into Pan: Transfer the dough to the prepared pan, pressing evenly with a spatula. Top with extra chocolate chips or sprinkles if desired.
Bake: Bake for 20-25 minutes or until the edges are golden but the center is still slightly soft.
Cool: Let the cookie cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve: Slice and serve as is or with ice cream!
