Add all of the batter ingredients to a blender and blend for ~15 seconds until smooth (you can also whisk by hand).
Spray some oil in a hot pan, pour in all of the batter for a large omelette, or half for 2 smaller ones, and gently use a spatula to spread it evenly, then cook for 3 mins on medium-high heat.
If serving plain, flip over and cook for a further 2 minutes. If you’re adding fillings, fold in half like a traditional omelette and cook a further 2 minutes.
Cut into strips for babies under 12 months, and serve warm.
Store in the fridge for up to 2 days.