CBS' 2 Broke Girls returns from its short winter hiatus tonight with a new episode, titled "And the Secret Ingredient".

Caroline discovers a new addiction in tonight's episode: extreme couponing.  But something unexpected happens while Caroline is in the throes of her new addiction - she actually discovers the secret ingredient to Max's cupcakes.  Scandal ensues!

Caroline also seems to develop a snarky backbone in tonight's 2 Broke Girls, as you can see from the trailer for the episode.  The sweet blonde loses her temper and snarks back at a customer, while Max happily welcomes her to the "land of the bitter waitress".

Horse Chestnut also makes a surprise reappearance in tonight's episode and Max heads over to the stables to have a moment with the girls' former pet.

Watch a trailer below for tonight's new episode of 2 Broke Girls, airing at 8:30 p.m. ET on CBS.