Anything low carb.
Which tends to rule out cereals & porridge, baked beans , toast, jam. Though probably since you're asking in the
Type 2s with insulin section insulin you may have a bit more leeway carbs wise than type 2s on oral meds or diet alone.
Instead try eggs, bacon, high (e.g.95%) meat content sausages, mushrooms . small tomato, cheese, yoghurt & berries, or virtually any other low carb higher fat that you fancy eating. There's no rule that says you
have to eat normal/traditional breakfast foods, and this gives you a huge choice. Have a search of the low carb forum too - there are regular threads on this topic and plenty of other tasty suggestions.
Robbity