Both of these mellow productions focus on one female main character who lives humbly and enjoys the small things in life as she works on making food after a long day.
Both are short warm dramas focusing on the preparation of a single meal or dessert per episode, with the lead expressing emotions around it. Both have a cozy feel.
Both shows put a strong focus on the preparation of one specific dish per episode. There is a bit more actual plot to Kinou Nani Tabeta? but I think the food part still plays a major role.