  We investigate the weak decay of one-neutron halo nuclei into the proton-core
continuum, i.e., beta-delayed proton emission from the halo nucleus using a
cluster effective field theory for halo nuclei. On the one hand, we calculate
the direct decay into the continuum. On the other hand, we consider the case of
resonant final state interactions between the proton and the core. We present
our formalism and discuss the application to the decay of $^{11}$Be in detail.
Moreover, we compare to recent experimental results for the branching ratio and
resonance parameters. As another example, we consider the case of $^{19}$C and
predict the branching ratio for beta-delayed proton emission.
