Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement No. 333-259810 on Form S-1 of our report dated September 27, 2021, relating to the balance sheet of Portillo’s Inc. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ Deloitte & Touche LLP

Chicago, Illinois

October 12, 2021