The story framing: what happened, why, what's next.
Every variance worth explaining gets three sentences. Not three paragraphs. Three sentences, in this order: what happened (the variance, in dollars and direction), why (which of the five drivers, with the specific cause), and what's next (the action you're taking or recommending).
The three-sentence frame disciplines the analysis. If you can't write the "why" sentence, you don't understand the variance yet. If you can't write the "what's next" sentence, the analysis is incomplete — variance without action is reporting, not management.
An example: "F&B departmental profit was $42,000 below budget in March. Driven primarily by food cost running at 36.1% versus budget of 32.5%, which traces to a switch in protein supplier in mid-February that introduced a 6% cost increase the team didn't surface in time. Returning to the prior supplier from April 1; expecting food cost to revert by month-end."
Three sentences. The variance, the cause, the action. This is the unit of value in any monthly financial review.