  We propose a two-parameter, static and spherically symmetric regular
geometry, which, for specific parameter values represents a regular black hole.
The matter required to support such spacetimes within the framework of General
Relativity (GR), is found to violate the energy conditions, though not in the
entire domain of the radial coordinate. A particular choice of the parameters
reduces the regular black hole to a singular, mutated Reissner-Nordstr\"om
geometry. It also turns out that our regular black hole is geodesically
complete. Fortunately, despite energy condition violation, we are able to
construct a viable source, within the framework of GR coupled to matter, for
our regular geometry. The source term involves a nonlinear magnetic monopole in
a chosen version of nonlinear electrodynamics. Finally, we obtain the shadow
profile of the regular black hole and try to estimate the metric parameters
using some recent observational results from the EHT collaboration.

General Relativity and Quantum Cosmology