Preheat oven to 325°F. Line a cookie sheet with parchment paper.
Melt the butter in the microwave and let cool while you prep the rest of the ingredients.
1/2 cup butter
In a large bowl, whisk melted butter, brown sugar, and sugar. Add in vanilla and egg. Whisk until smooth.
2/3 cups light brown sugar, 2 tbsp white sugar, 2 egg yolks, 1 tbsp vanilla
Add in flour, baking soda, and salt. Use a rubber spatula and fold the dough until just combined. Do not over mix! Add in Oreo pieces and semi-sweet chocolate chips and fold into dough.
1/2 tsp baking soda, 1 1/3 cups all-purpose flour, 1/2 tsp salt
Scoop 6 cookie dough balls and place on the prepared cookie sheet.
1/2 cup semi-sweet chocolate chips, 1/2 cup Oreos
Bake for 13-16 minutes. Mine took 16 minutes. The cookies will be ready when the edges are a golden brown, but the inside will look very soft. Remove from oven and add more Oreo pieces and chocolate chips if desired on top. Let the cookies cool on the hot pan for a few minutes before serving warm or cool completely and enjoy!