If this was high carb and high sugar, it will spike bg quite quickly. If you ate just after bolus from omnipod, the insulin isn’t totally working yet. Even a 15 minute wait would help, but 60 high carbs without protein/fats to slow digestion will aften give a quick rise.
So some options are:
Wait longer after bolus. If you are using CGMS, its easy to catch when insulin kicks in. If not, do bg checks.
Include fat/protein with meal, eat before cereal.
Check if your bg normally rises after getting up. This is common for many, and with pump typically program a higher basal rate. Have you skipped breakfast and observed how much your bg moves?