peptide MHC microarray
According to this paper (Yoav Soen et al. PLoS Biology 2003), peptide:MHC microarrays are a type of cellular microarray (a microarray designed to identify cell types; Wikipedia). These microarrays have attached a MHC molecule bound to a peptide, which allows them to work as artificial antigen presenting cells (APCs) that activate specific subpopulations of T cells.

Another recent paper is here where they specifically use the word recombinant peptide:MHC.

The expression MHC restricted refers to the positive selection (in the thymus) of T cells that recognize MHC molecules of the host but not other self-antigens (Wikipedia).