  We shall establish the interior H\"older continuity for locally bounded weak
solutions to a class of parabolic singular equations whose prototypes are
\begin{equation} u_t= \nabla \cdot \bigg( |\nabla u|^{p-2} \nabla u \bigg),
\quad \text{ for } \quad 1<p<2, \end{equation} and \begin{equation}
  u_{t}- \nabla \cdot ( u^{m-1} | \nabla u |^{p-2} \nabla u ) =0 , \quad
\text{for} \quad m+p>3-\frac{p}{N}, \end{equation} via a new and simplified
proof using recent techniques on expansion of positivity and $L^{1}$-Harnack
estimates.
