Reasons why Maple Taffy's & Schneeball's dynamic/ relationship is extremely well-written.
Maple Taffy Cookie and Schneeball Cookie are both higher-ups at the Relic Management Division, the manager and ace manager of the division respectively.
At first they might seem completely different, but they're actually more like 2 sides of the same coin. The Relic Management Division focuses around 2 things—the preservation of relics and studying relics.
Maple Taffy focuses on preservation. He cleans, collects, stores and displays relics. To the point he'll even ask his co-workers to make him specialised displays.(Like how he asked Croissant to build him a specialised display for his dragon egg fossils, as they all need specific conditions to be preserved correctly.)
Schneeball is oriented more towards the study of relics. To the point of completely breaking them apart to uncover as much as possible. She prides herself most in her research.
Both of them have the same burning passion for relics as the other. They just go about their love for relics differently. But these differences makes them the perfect duo for the division they work in!
They make jokes at the other's expense straight to their face all the time. But they never seem to mind, usually they just return the banter. Neither of them do this with Marble Bread, Dark Fondue or anyone else. They only do this with eachother and it's always towards one another, never behind the other's back.
They're also shown to genuinely care for one another. In one scene Schneeball asks Maple Taffy if he's finished writing the report he had to. She realises she didn't and states she knew he didn't, which is why she came to check. Showing she knows he's a huge procrastinator.(Which, real bro, can't blame him.) She then comes to help him write the report, and then submitting it just before the deadline. Schneeball states how she bets the Director is going to love it. Maple Taffy, who knows Timekeeper, unlike Schneeball, knows dang well Timekeeper doesn't even peep at the reports. But he doesn't tell Schneeball anything, and just let's her have her moment of joy.
In Relic Management Chaos! after Maple Taffy ends up in a relic, Dark Fondue tells Schneeball that if she saves him that would prove she's competent enough to become the manager of the division. Schneeball reluctantly says she will get him for her, but clearly not for the promotion, as she would've been much more excited then. She even ends up calling Maple Taffy multiple times after they realise they can call one another.
Other characters are never alarmed when they argue. Baguette (who can read people really well) even states they seem to be having fun whenever they quabble. Maple Taffy also makes sure to call over Schneeball whenever they get new relics so they go over them together.
(Or none of this was intended by the writers and I'm just going insane due to the lack of TBD updates.)