A rich-quench-lean combustor assembly for a gas turbine engine defining an axial direction, the combustor assembly comprising: a liner extending between a forward end and an aft end, the liner comprising a plurality of quench air jets positioned between the forward end and the aft end; a dome attached to or formed integrally with the liner, the dome and the liner together defining at least in part a combustion chamber; and a fuel nozzle attached to the dome, the fuel nozzle configured as a premix fuel nozzle for providing a substantially homogenous mixture of fuel and air to the combustion chamber, the mixture of fuel and air having an equivalence ratio of at least 1.5, wherein the fuel nozzle comprises: a centerbody; an outer sleeve surrounding the centerbody, wherein a section of the outer sleeve comprises at least one radially oriented vane; an inner sleeve disposed between the centerbody and at least a section of the outer sleeve, wherein a portion of the inner sleeve comprises a contoured shroud and wherein the inner sleeve and a portion of the outer sleeve defines at least one fuel injection port disposed upstream of the contoured shroud; and at least one axially oriented vane defined between the centerbody and a section of the inner sleeve, wherein the axially oriented vane is disposed upstream of the fuel injection port. a liner extending between a forward end and an aft end, the liner comprising a plurality of quench air jets positioned between the forward end and the aft end; a dome attached to or formed integrally with the liner, the dome and the liner together defining at least in part a combustion chamber; and a fuel nozzle attached to the dome, the fuel nozzle configured as a premix fuel nozzle for providing a substantially homogenous mixture of fuel and air to the combustion chamber, the mixture of fuel and air having an equivalence ratio of at least 1.5, wherein the fuel nozzle comprises: a centerbody; an outer sleeve surrounding the centerbody, wherein a section of the outer sleeve comprises at least one radially oriented vane; an inner sleeve disposed between the centerbody and at least a section of the outer sleeve, wherein a portion of the inner sleeve comprises a contoured shroud and wherein the inner sleeve and a portion of the outer sleeve defines at least one fuel injection port disposed upstream of the contoured shroud; and at least one axially oriented vane defined between the centerbody and a section of the inner sleeve, wherein the axially oriented vane is disposed upstream of the fuel injection port. a centerbody; an outer sleeve surrounding the centerbody, wherein a section of the outer sleeve comprises at least one radially oriented vane; an inner sleeve disposed between the centerbody and at least a section of the outer sleeve, wherein a portion of the inner sleeve comprises a contoured shroud and wherein the inner sleeve and a portion of the outer sleeve defines at least one fuel injection port disposed upstream of the contoured shroud; and at least one axially oriented vane defined between the centerbody and a section of the inner sleeve, wherein the axially oriented vane is disposed upstream of the fuel injection port.