Kitaev quantum spin liquids have been the focus of intense research effort owing to the discovery of various materials (e.g., ${\mathrm{RuCl}}_3$) that approximate their intriguing physics. In this Letter we construct a mean-field approximation for a moiré superlattice emerging in twisted Kitaev bilayers in terms of solutions of commensurate bilayers. We show that the band structure of deconfined spinons, defined on the mini-Brillouin zone of the superlattice, is greatly modified. The system exhibits a hypermagic manifold: a series of nearly perfectly flat bands appear at energies above the lowest gap, exhibiting a very large local (spinon) density of states that could potentially be probed experimentally. Intriguingly, flat-band eigenstates exhibit a localization akin to wave functions of kagome lattices.

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• Quantum spin liquid
• Twisted bilayer graphene
• van der Waals systems