19x13 Baking Pan (Non-stick, straight sides for even layers)
Mixing bowls (Large enough for batter mixing)
Hand/stand mixer (For smooth cookie dough and brownie batter)
Rubber spatula (Helps with even spreading)
Offset spatula (For leveling the brownie layer)
Parchment paper (Makes removing brownies easier)
Double Boiler (Optional, for melting chocolate)
Make the Cookie Base
Cream butter and sugars until fluffy.
Add egg and vanilla, mixing well.
Stir in flour, baking soda, and salt until just combined.
Fold in chocolate chips.
Press dough into a parchment-lined 9x13 pan.
Chill in the fridge while preparing the next layer.
Prepare the Brownie Layer
Melt chocolate and butter together until smooth.
Whisk in sugar, eggs, and vanilla.
Sift in cocoa powder, flour, and salt, stirring gently.
Pour brownie batter over the Oreo layer and spread evenly.
Bake to Perfection
Preheat oven to 350°F (175°C).
Bake on the center rack for 30-35 minutes.
Insert a toothpick in the center—moist crumbs are okay.
Serving: 100g | Calories: 380kcal (19%) | Carbohydrates: 48g (16%) | Protein: 4g (8%) | Fat: 20g (31%) | Saturated Fat: 10g (63%) | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Trans Fat: 0.2g | Cholesterol: 55mg (18%) | Sodium: 180mg (8%) | Potassium: 140mg (4%) | Fiber: 2g (8%) | Sugar: 34g (38%) | Vitamin A: 300IU (6%) | Calcium: 40mg (4%) | Iron: 2mg (11%)