We report more than two octave spanning mid-IR flat-top supercontinuum (SC) generation using all normal -borosilicate hybrid photonic crystal fiber. Our design is based on a chalcogenide photonic crystal fiber (PCF), where the first ring composed of six air holes is made by borosilicate glass. By injecting 50-fs pulses with 1.6 nJ energy at in the all normal dispersion (ANDi) regime, a flat-top broadband SC extending from 1 to with high-spectral flatness of 8 dB is obtained in only 4-mm fiber length. To the best of our knowledge, we present the broadest flat mid-IR spectrum generated in the ANDi regime of an optical fiber. The self-phase modulation and the optical wave breaking are identified as the main broadening mechanisms. The obtained broadband light source can be potentially used in the field of spectroscopy and in high-resolution optical coherent tomography owing to the high-spectral SC flatness generated by our designed fiber.