I was given a solution to include "Chapter" before my section entries in the ToC, however the number of the section does not get transferred to the ToC! For instance, in the MWE below, the sections are called "Chapter 1 \break Section One" and "Chapter One \break Section Two", however in the ToC, the sections are listed as "Chapter Section One" and "Chapter Section Two", and thus omitting the section numbers. I'd like to include these section numbers in the ToC.
Thanks!
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage[showframe]{geometry}
\usepackage{titlesec}
\usepackage{titletoc}
\addto\captionsenglish{ \renewcommand*\contentsname{\centerline{TABLE OF CONTENTS}}}
\titleformat{\section}[display]%
{\null\vskip1em\sffamily\bfseries\filcenter}{Chapter \thesection}{0em}{}[]
\titleformat{name = \section, numberless}[block]%
{\null\vskip1em\sffamily\bfseries\filcenter}{}{0em}{}
\titlespacing*{\section}{0em}{1em}{1em}
\titlecontents{section}
[7em] % ie, width of contentslabel + 0.5em
{\medskip}
{\contentslabel[\MakeUppercase\chaptername~]{6.5em}}%\thecontentslabel
{\hspace*{-6.5em}}
{\titlerule*[0.5pc]{.}\contentspage}
\begin{document}
\tableofcontents
\newpage
\section*{An Unnumbered Section}
\addcontentsline{toc}{section}{An Unnumbered Section}
\section{Section One}
\subsection{A first subsection}
\section{Section Two}
Content
\end{document}
{Chapter \thesection}
with{Chapter 1 \thesection}
or similar? It's odd that you talk about writing a thesis with the article class, and wanting chapters. Typically, these would be written with report, book, or other classes with built-in chapters.