In this talk, I will present a novel route to topological superconductivity in one dimension, based on Josephson junctions in which two superconductors are separated by a two-dimensional electron system with strong spin-orbit coupling. Remarkably, in these systems, a phase bias can induce a robust topological superconducting phase in the junction, requiring no fine-tuning of other parameters, in contrast to the more commonly studied wire realization. Moreover, we identify a regime of parameters for which the system can tune itself into the topological phase via a first-order phase transition.