1-First Step: Prepare Mise en Place Soften 1 cup butter at room temperature for 30 minutes. Measure all ingredients: 1 ½ cups brown sugar, ½ cup granulated sugar, 2 eggs, 2 tsp vanilla, 2 ¼ cups flour, 1 tsp baking soda, 1 tsp salt, and 2 cups chocolate chips. Have your sheet pan ready. This setup keeps things smooth and prevents overmixing later.

2-Second Step: Cream Butter and Sugars In a large bowl, beat softened butter, brown sugar, and granulated sugar with a mixer on medium for 2 minutes until light and fluffy. Scrape sides often. This step incorporates air for tenderness skip it, and your cookie cake turns dense.

3-Third Step: Add Wet Ingredients Beat in 2 eggs one at a time, then add 2 tsp vanilla. Mix until combined, about 1 minute. The mixture should look smooth and glossy. Room-temperature eggs blend better, avoiding lumps.

4-Fourth Step: Incorporate Dry Ingredients Whisk flour, baking soda, and salt in a separate bowl. Gradually add to wet mixture on low speed until just combined no overmixing, or gluten develops for toughness. Dough will be thick and sticky.

5-Fifth Step: Fold in Chocolate Chips Gently fold in 2 cups chocolate chips by hand with a spatula. Reserve a handful for topping. Distribute evenly for every bite to have melty goodness.

6-Sixth Step: Spread in Pan and Chill Transfer dough to prepared 18×13-inch pan. Use wet hands or offset spatula to spread evenly to edges, about ½-inch thick. Chill 30 minutes for thicker, chewier results pro move for cookie cake perfection.

7-Seventh Step: Bake to Golden Perfection Bake at 350°F for 20-25 minutes. Edges turn golden, center sets but stays soft toothpick should have moist crumbs. Rotate pan halfway if your oven heats unevenly. Overbaking dries it out; underbaking leaves it raw.

8-Eighth Step: Cool Completely Let cool in pan on wire rack 30 minutes, then fully at room temp 1-2 hours. Prevents frosting meltdown.

9-Ninth Step: Make and Apply Frosting Beat 8 oz softened cream cheese and ½ cup butter 2 minutes. Gradually add 4 cups powdered sugar and 1 tsp vanilla; beat until fluffy. Spread over cooled cake, sprinkle mini chips. Slice into squares.