McDonald's adds the toppings—whether Oreos, M&M's, or peanut butter crunch ingredients, to their famous vanilla soft serve, and then blends the sweets into the ice cream. At one time all locations had a big machine to do this, with a square, plastic spoon that served as both the mixing paddle and the thing you ate them with. However, many locations ditched the space-taking machine and now just mix them by hand.