Basically you can use what every you have in the fridge but a few of my faves are:
Skyr Protein Yoghurt
Frozen blueberries an raspberries
I then top these with homemade granola and fresh fruit.
They are so filling so they put me on until lunchtime always. If I don't fancy it for breakfast I take it to work in the blender container and eat it for lunch as a yoghurt or it makes a good sweet dessert if your craving something after tea.
You can what ever you like there are so many variations.
I enjoy a few dates chucked in too or you can protein powder for consumption after a workout.