Blueberry muffin? So many of the commercially-prepared ones have white flour and are highly-processed. Don't eat the muffin.
Consider a small pre-bolus. Use enough that you might drop to 4.5 if you forgot to eat. Then follow with whatever you need (possibly including a superbolus, as mentioned above) when you eat.
A faster-acting insulin analog might help, too.
You also could try eating more slowly. Personally, I find this option unattractive and difficult-to-maintain.
