My sister also does stuff like that. She makes the best oreo milkshake and brews the most amazing coffee. She hasn’t made a bad drink once!
I know how she makes oreo milkshake but the recipe depends on how much you’re making. I’ll tell you the one I know. Add ice to the first line then add milk to the second. Break some oreos in big pieces then put them in. About 3 normal packets is good. Mix that until fully mixed. add a big scoop if vinilla ice cream and some more ice then mix it up. You can add more oreos if you want. In my opinion it’s a great oreo milkshake and the forst time I’ve ever finished a drink in a big cup with a straw.