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We present the discovery of \thisstar\ (HD 58730), a very low mass ratio ($q\equiv M_2/M_1 \approx 0.07$) eclipsing binary (EB) identified by theKilodegree Extremely Little Telescope (KELT) survey. We present the discoverylight curve and perform a global analysis of four high-precision ground-basedlight curves, the Transiting Exoplanets Survey Satellite (TESS) light curve,radial velocity (RV) measurements, Doppler Tomography (DT) measurements, andthe broad-band spectral energy distribution (SED). Results from the globalanalysis are consistent with a fully convective ($M_2 = 0.22 \pm 0.02\M_{\odot})$ M star transiting a late-B primary ($M_1 = 3.34^{+0.07}_{-0.09}\M_{\odot};\ T_{\rm eff,1} = 11960^{+430}_{-520}\ {\rm K}$). We infer that theprimary star is $183_{-30}^{+33}$ Myr old and that the companion star's radiusis inflated by $26 \pm 8\%$ relative to the predicted value from a low-massisochrone of similar age. We separately and analytically fit for thevariability in the out-of-eclipse TESS phase curve, finding good agreementbetween the resulting stellar parameters and those from the global fit. Suchsystems are valuable for testing theories of binary star formation andunderstanding how the environment of a star in a close-but-detached binaryaffects its physical properties. In particular, we examine how a star'sproperties in such a binary might differ from the properties it would have inisolation.

An Extreme-mass Ratio, Short-period Eclipsing Binary Consisting of a B Dwarf Primary and a Pre-main Sequence M Star Companion Discovered by KELT