Where's the letter " "?

Unbeknown to me, while sitting on the cushy couch, munching on butter cookies, drool running down my chin, one well known letter went missing. Where did it go? I don't know. Where do letters go when things become difficult? Obviously not in my blog. These delicious cookies melt in my mouth. Mmm. Mmm. Delicious. Girl Scout cookies come close to the deliciousness of the butter cookies, but they're not butter cookies. Let's see, where would letters run off too? Where would they go? If I decided to run off, I would go somewhere where I knew there would be butter cookies. Butter cookies. Delicious. Butter cookies. Mmm. Delicious. I wish the letter would pop up in my blog. Then I could let everyone know the type of butter cookies I desire. Mmm. Mmm. Butter cookies. How I desire thee. Melt in my mouth, delicious butter cookies. Melt in my mouth. Come to me. Come into my mouth. I will munch on you until there is nothing left of you. Mmm. Butter cookies. Missing letter, we need you!