  We present a model for cosmological inflation based on a no-scale
supergravity sector with an SU(2,1)/U(1) Kahler potential, a single modulus T
and an inflaton superfield Phi described by a Wess-Zumino model with
superpotential parameters (mu, lambda). This model yields a scalar spectral
index n_s and a tensor-to-scalar ratio r that are compatible with the Planck
measurements for values of lambda simeq mu/3M_P. For the specific choice lambda
= mu/3M_P, the model is a no-scale supergravity realization of the R+R^2
Starobinsky model.
