Two-dimensional electron gases (2DEGs) at KTaO₃ surfaces have emerged as a promising system for investigating strong spin–orbit interactions, Rashba splitting, and superconductivity at low carrier densities. In many existing approaches, however, carrier generation at KTaO₃ surfaces relies on the growth of chemically complex overlayers, which often masks the native electronic structure and hinders direct spectroscopic characterization. In this work, we present a simple route to realize a superconducting 2DEG on KTaO₃(111) through Mg-induced surface reduction with molecular-beam epitaxy (MBE). Because Mg exhibits a very low sticking coefficient at elevated temperatures, the process yields only an ultrathin MgO overlayer (<1–2 monolayers), which remains sufficiently transparent to soft X-ray photoemission (XPS) and angle-resolved photoemission spectroscopy (ARPES). This enables direct access to both surface chemistry and electronic structure without any several-nanometer-thick capping layers. XPS indicates the emergence of reduced Ta species, while ARPES resolves a dispersive Ta 5d band with a bandwidth of approximately 150 meV and additional confinement-induced subbands. Electrical transport further reveals a superconducting transition below 0.7 K. Our results introduce a straightforward platform for creating spectroscopically accessible oxide 2DEGs and open a route to systematically study orientation-dependent superconductivity in KTaO₃.