The correct option to fill in the blank is "its." The sentence should read: "Tito’s Taco Palace stuffs its tortillas with many unusual items; for example, you can order peanut butter and guava jelly burritos or cricket and mango tacos."
In this context, "its" is used to refer to the tortillas produced by Tito's Taco Palace, as it's a singular noun (the establishment).