Is it really so hard to come up with a somewhat interesting story. Fmc is a banished noble (not isekaid), so she works somewhere (a bakery). Because of her status, there is conflict between her and her co-workers, which she overcomes over time. The Mmc is an adventurer who's just starting out, he has a sweet tooth, so he visits the Fmc's bakery and falls in love with her at first sight, or after eating some sweets that she prepared. The Fmc can then work as the vehicle for the story, the Mmc visits the bakery to enjoy sweets, while telling her how his adventures went. While they keep falling in love, they can get some backstory, and her affection for the Mmc can be deepened because he tries her weird sweets, and because he tries hard, while the Mmc's feelings deepen because she cares for him and supports him. Maybe the Mmc can help her with leftover family affairs. You can have any amount of drama added, like Mmc goes missing and Fmc goes looking for him, co-workers trying to get the Mmc, the Mmc's party members trying to get the Fmc, Fmc getting kidnapped for political reasons...