The range is now available in 38 stores throughout Ireland and features four-packs of Iced Tops (iced Madeira buns), Jammy Rounds (Madeira buns dipped in raspberry syrup and coated in coconut) and Jam Bakes (pastry cases filled with jam and topped with Madeira sponge), which will sit alongside M&S' Irish breads and morning goods ranges.
Genesis will also supply apple and rhubarb pies, both part-baked and frozen, for bake-off in M&S' in-store bakeries.
"For M&S to have chosen Genesis as a partner is a major vote of confidence in the skills of our bakers and our company values," commented Brian McErlain, managing director. He added that the firm has already had enquiries from other leading retailers about developing own-brand ranges for them.
Genesis is only the 16th food and drink company in Northern Ireland to successfully gain M&S supplier accreditation.