📖 Instructions

1. Preheat the oven to 350°F (175°C). This step is crucial; a properly heated oven ensures even baking.
2. Grease a 9-inch round cake pan. I like using butter for this, but cooking spray works just as well. Just make sure every nook and cranny is covered to prevent sticking. Lining the bottom with parchment paper can really help too.
3. In a large bowl, cream together the butter and both sugars until light and fluffy. The mixture should look pale and feel almost airy. This might take a few minutes, so don't rush it! If you have an electric mixer, now's the time to use it.
4. Beat in the egg and vanilla extract until well combined. Make sure the egg is fully incorporated before moving on to the next step. A little extra vanilla never hurt anyone!
5. In a separate bowl, whisk together the flour, baking soda, and salt. Whisking ensures there are no lumps of baking soda hiding in the flour. It's a small step that makes a big difference.
6. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix; that's how cookies get tough. A few streaks of flour are okay at this point.
7. Stir in the chocolate chips. Use as many or as few as you like! I'm a chocolate fanatic, so I always add a generous amount. You could also use other mix-ins like nuts, M&Ms, or dried fruit.
8. Press the dough evenly into the prepared cake pan. Use your fingers or the back of a spoon to spread it out. Aim for a consistent thickness across the entire pan.
9. Bake for 20-25 minutes, or until the edges are golden brown and the center is set. Keep a close eye on it; ovens vary, and you don't want to burn the bottom. A toothpick inserted into the center should come out with a few moist crumbs attached.
10. Let the cookie cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely. Cooling it slightly in the pan helps it set up and prevents it from breaking.
11. While the cookie cake is cooling, prepare the frosting. In a large bowl, beat together the butter and cream cheese until smooth and creamy. Again, an electric mixer is your best friend here.
12. Gradually add the powdered sugar, beating until smooth. If the frosting is too thick, add a tablespoon of milk at a time until you reach your desired consistency. Don't be afraid to taste-test along the way!
13. Stir in the vanilla extract and a pinch of salt. These enhance the flavor and balance the sweetness. A little salt goes a long way!
14. Once the cookie cake is completely cool, frost it with the prepared frosting. Get creative with your decorations! Sprinkles, candies, and chocolate shavings are all great options.
15. Slice, serve, and enjoy! This cookie cake is best enjoyed fresh, but it will keep in an airtight container at room temperature for a few days. Though, let's be real, it probably won't last that long.