Preheat the oven to 350° F and line a cookie sheet with parchment paper.
Beat the vegan butter, sugars, salt and vanilla in a bowl.
Add the flax egg and mix again.
Next, add the flour and baking soda to the bowl and mix until fully incorporated. If the dough is too dry and crumbly, add in 1/2 tbsp of plant milk until a uniform dough forms.
Hand mix the chocolate chips/chopped chocolate and Oreos and add to dough.
Roll dough into equally sized balls and place on pan and bake for 12-14 minutes or until edges are just set.