  Supergravity theories with non-minimal K\"ahler potentials are characterized
by a non-trivial field space manifold with corresponding non-trivial kinetic
terms. The scattering amplitudes in these theories can be calculated at fixed
background field values by making a field redefinition to Riemann normal
coordinates. Because of the K\"ahler structure of supergravity, a more compact
method for calculating amplitudes is obtained by a redefinition to K\"ahler
normal coordinates. We compare both methods and calculate the explicit
transformations and amplitudes for several examples in the context of no-scale
supergravity with one and two chiral superfields. We show that in all cases the
equivalence of the scattering amplitudes using either Riemann normal or
K\"ahler normal coordinates is possible only at extremal points of the scalar
potential.
