Straight away at 6 months x
Go for it, my kid was struggling to eat until we added spices and now he loves his food. Homemade garlic bread was a relevation to him. 😂
My two have had spices and herbs since they’ve started eating. They eat a lot of what we eat.
When we started food which was at 6 months.
I started at 6 months.. Cumin, garlic powder, onion powder.. almost everything!