We compute general higher-point functions in the sector of large charge operators ϕn, {overline{phi}}^n at large charge in O(2) {left(overline{phi}phi right)}^2 theory. We find that there is a special class of “extremal” correlators having only one insertion of {overline{phi}}^n that have a remarkably simple form in the double-scaling limit n →∞ at fixed g n2 ≡ λ, where g ~ ϵ is the coupling at the O(2) Wilson-Fisher fixed point in 4 − ϵ dimensions. In this limit, also non-extremal correlators can be computed. As an example, we give the complete formula for leftlangle phi {left({x}_1right)}^nphi {left({x}_2right)}^noverline{phi}{left({x}_3right)}^noverline{phi}{left({x}_4right)}^nrightrangle , which reveals an interesting structure.