  In this work we introduce a new plateau-like inflationary model including a
quadratic scalar potential coupled non-minimally to gravity. This potential has
a dominant constant energy density at early times which can realize successful
inflation. It also includes an infinitesimal non-zero term $V_0$ responsible
for explaining dark energy which causing the universe to expand accelerating at
the late time. We show that this model predicts small tensor-to-scalar ratio of
the order of $r\approx 0.01$ which is fully consistent with Planck constraints.
Using the lower and upper bounds on reheating temperature, we provide
additional constraints on the non-minimal coupling parameter $\xi$ of the
model. We also study the preheating stage predicted by this kind of potentials
using numerical calculations.
