  We consider the diffusive Hamilton-Jacobi equation $u_t - \Delta u = |\nabla
u|^p$ in a bounded planar domain with zero Dirichlet boundary condition. It is
known that, for $p>2$, the solutions to this problem can exhibit gradient
blow-up (GBU) at the boundary. In this paper we study the possibility of the
GBU set being reduced to a single point. In a previous work [Y.-X. Li, Ph.
Souplet, 2009], it was shown that single point GBU solutions can be constructed
in very particular domains, i.e.~locally flat domains and disks. Here, we prove
the existence of single point GBU solutions in a large class of domains, for
which the curvature of the boundary may be nonconstant near the GBU point.
  Our strategy is to use a boundary-fitted curvilinear coordinate system,
combined with suitable auxiliary functions and appropriate monotonicity
properties of the solution. The derivation and analysis of the parabolic
equations satisfied by the auxiliary functions necessitate long and technical
calculations involving boundary-fitted coordinates.
