If you want his landmark high-level CEO account of program management of SHAEF in WWII that includes detail of the Holocaust, it's Crusade in Europe. Written in plain language.
His personal accounts to his superior officer (Gen. George C. Marshall) comes in the assembly of his letters of report: Dear General: Eisenhower's Wartime Letters to Marshall
He also submitted a report that's in the public domain covering the daily operations from his ascension to Allied Supreme Commander through VE Day. You might find it on Archive.org in several formats.
>“Get it all on record now – get the films – get the witnesses – because somewhere down the track of history some bastard will get up and say that this never happened.” – General Dwight D. Eisenhower, on the Holocaust.