The recipe below is for a 9×13 inch pan. It can easily be halved and made in an 8×8. The bake time will be slightly shorter – about 32-37 minutes. Note that there is not quite enough batter to half the recipe and make it in a 9×9 inch (23×23 cm) pan.
**Because the cookie dough layer uses 1 large egg plus 1 additional egg yolk, when halving the recipe you can simply use 1 large egg. It won’t be exactly halved, but I found it still works.
Ingredients
Chocolate Chip Cookie Layer
¾ cup unsalted butter (168 grams) softened
½ cup brown sugar (105 grams)
½ cup white sugar (100 grams)
1 large egg
1 large egg yolk discard the white
1 teaspoon vanilla extract
1 ½ cups all-purpose flour (188 grams) aka plain flour
¼ teaspoon salt
⅔ cups chocolate chips (120 grams)
Oreo Layer
28 Oreo cookies
Brownie Layer
½ cup unsalted butter (112 grams) cubed
6 oz dark chocolate (170 grams) 50-70% or semi-sweet
1 cup granulated sugar (200 grams)
2 large eggs
½ cup all-purpose flour (63 grams)
¼ cup cocoa powder (23 grams)
½ teaspoon salt
US Customary – Metric
Instructions
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