cereals

For breakfast, I have some milk and cereals.
For breakfast, I have some milk and cereal.

When talking about breakfast food in general, cereal is normally uncountable: ‘I usually have cereal with milk.’

Use cereals when talking about different types of breakfast cereal: ‘The shop sells several healthy breakfast cereals.’

Cereals can also mean plants that produce grain: ‘Farmers in this area grow cereals such as wheat and barley.’