In a large mixing bowl or stand mixer bowl, beat butter and sugar for 2 minutes until slightly airy. Add eggs and vanilla and mix on low until fully blended.
Add dry ingredients in the order above and mix in flour 1 cup at a time mixing between each cup.
Dough will be stiff at this point. On low speed, mix in the chocolate chips for a few intervals only. Add Oreo pieces. Mix a few intervals only.
Place 1/3 cup sized dough balls onto baking sheets. I did 6 per sheet, two -three sheets.
Bake at 375 F for 8-10 minutes until the first sight of brown on top of the cookies. Remove and cool for 5 minutes before transferring onto cooling racks. Enjoy!!!