I finally had my first (and second) Frontier cookie today on MSP-DEN. Last week's DEN-MDW didn't have any, so maybe the cookie has finally arrived to the Frontier network.
After hearing about the Midwest cookies for years, but never having one, I must say the Frontier cookie, although good, was a bit of let down. I don't know why, but I was thinking they were going to serve them warm. They came out in a big, white, non-descript box, with no branding and were served at room temperature. The flight attendants gave 2 cookies per passenger which was very nice.
A surprise to me was how many folks declined the cookies. I don't think I could ever pass up a free cookie.