I've found that cooking extra food with the intent of freezing it in individual portions is a game changer for when I'm alone at home - my fiancée can also pack them for lunch. Rice, curries, ragoûts are really nice to get out of the freezer, put on a plate in the microwave and eat a few minutes later.
Look at Souper Cubes (or any silicon knockoff) for the molds.
Look at Souper Cubes (or any silicon knockoff) for the molds.