Put all of the ingredients into a bowl or on a plate.
Mix well to combine everything evenly.
Store in an air tight container.
Notes
We like to use flaked sea salt, as it gives the bagel seasoning a big more texture, but if you only have coarse sea salt then that is fine. It will look like a lot of salt, but it's essential for that authentic everything bagel seasoning flavour.
If you want to, you could toast the seeds before adding them to the mix, and it will add a bit more flavour, but you don't have to.
However, if you are using the seasoning for bagels, do not toast the seeds first, otherwise they will burn in the oven on the bagel.