Why Does Milk Taste Good with Cookies?

I just had this conversation with my four year old.

"Why does milk taste good with chocolate chip cookies?"

It just does honey. Everyone knows that.

"But why daddy? Why?"

I don't know honey. It just does.

"But why daddy? But why daddy?"

Well. It's because cows have brown spots, and chocolate chip cookies have brown spots.

I wait for her reaction to the internal logic of my bullshit. She looks thoughtful.

"And cows have white, and milk is white."

That's right baby. That's why.