Exhibit 3.1

SECOND AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

WK KELLOGG CO

September 26, 2025

FIRST: The name of the corporation is WK Kellogg Co (the “Corporation”).

SECOND: The total number of shares of stock which the Corporation shall have authority to issue is 1,000, and the par value of each such share is $0.01, amounting in the aggregate to $10.00.

THIRD: The address of the Corporation’s registered office in the State of Delaware is 251 Little Falls Drive, Wilmington, County of New Castle, 19808. The name of the Corporation’s registered agent at such address is Corporation Service Company.

FOURTH: The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware as the same exists or may hereafter be amended (the “DGCL”).

FIFTH: The board of directors of the Corporation shall have the power to adopt, amend or repeal the bylaws of the Corporation.

SIXTH: Election of directors need not be by written ballot unless the bylaws of the Corporation so provide.

SEVENTH: The Corporation expressly elects not to be governed by Section 203 of the DGCL.

EIGHTH: (a) Except to the extent that the DGCL, as the same exists or hereafter may be amended, prohibits the elimination or limitation of liability of directors or officers for breaches of fiduciary duty, no person who is or was a director or officer of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty as a director or officer, notwithstanding any provision of law imposing such liability.

(b) No amendment to or repeal of this provision or by changes in law, or the adoption of any other provision of this Second Amended and Restated Certificate of Incorporation inconsistent with the foregoing paragraph, unless otherwise required by law, shall apply to or have any effect on the liability or alleged liability of any director or officer of the Corporation for or with respect to any acts or omissions of such director or officer occurring prior to such amendment, repeal or adoption of such inconsistent provision, provided, however, that if the DGCL is amended to permit further elimination or limitation of the personal liability of directors or officers, then the liability of a director or officer of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL as so amended.

NINTH: The Corporation reserves the right to amend this Second Amended and Restated Certificate of Incorporation in any manner permitted by the DGCL and all rights and powers conferred herein on stockholders, directors and officers, if any, are subject to this reserved power.

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