How can I uniformly chop peanuts?
As @Carey Gregory already mentioned about McDonald's, I generally cook for 6-10 people and for small kitty and birthday parties, so for that I use a manual nut chopper (with size adjustment bolt).  This gives me fine results of chopped nuts almost in equal shapes. For 2-5 servings, I simply use a sharp knife to chop them. I almost every time try to make them uniformly chopped. But obviously it's a time taking process, but you can do it if you are preparing for 3-5 servings. You can purchase the nut chopper with size adjustment bolt for much better result.