Out of the known gravitationally lensed systems, Q2235+0305 (the Einstein Cross) is perhaps the most studied, due to its brightness/vicinity and configuration (quasar at redshift z=1.695, lensing galaxy at z=0.0305). This system shows both macrolensing and microlensing effects, which offer a unique tool to investigate the innermost structure of the quasar. I present the preliminary results obtained analyzing thirty-five observations carried out over the last seventeen years by Chandra, and three XMM-Newton observations, among which only one has been published so far. The aim of this work is to study the X-ray variability of the quasar, investigate the regions where the high-energy photons originate and how they interact with the matter surrounding the black hole.