  We study the effects of the Higgs directly coupled to the inflaton on the
primordial power spectrum. The quadratic coupling between the Higgs and the
inflaton stabilizes the Higgs in the electroweak vacuum during inflation by
inducing a large effective mass for the Higgs, which also leads to oscillatory
features in the primordial power spectrum due to the oscillating classical
background. Meanwhile, the features from quantum fluctuations exhibit simple
monotonic k-dependence and are subleading compared to the classical
contributions. We also comment on the collider searches.
