In "Dreamscaperers," after seeing Gideon summon Bill Cipher, Mabel and Soos quickly go warn Dipper of his presence, but not before stopping at a store to get a bag of the snack food. When the three plan on going into Stan's mind, Soos asks if he should bring them in. He decides he will, but is not seen with them afterward.
The bag is mostly orange with some yellow. The name, "Burrito Bites," is located near the middle of the bag, "Burrito" in white lettering and "Bites" in red, below the Nyums brand name and above an image of two Burrito Bites. The Burrito Bites themselves, as the name suggests, look like tiny burritos.