With an electric mixer, beat butter and sugars together until light and fluffy.
Stir in flour.
Beat in milk and vanilla.
Stir in chocolate chips.
Notes
Don't have a mixer? No problem! You can make this recipe using melted butter. Combine the ingredients in a large bowl and mix by hand. The only thing is that this method makes the cookie dough greasy. You'll need to wait for the butter to solidify before you can enjoy it.
This recipe can be made vegan if vegan butter, non-dairy milk, and vegan chocolate are used.