Start making the bechamel by melting the olive oil on a saucepan and adding the flour.
When it starts to brown, cook it for 1 minute more and add the vegetable milk.
Stir with a whisk until it starts to get creamy. Add the nutmeg, salt, and pepper.
Notes
This sauce gets sticky very quickly, so; you should make it just when everything is ready to assemble.Plant milk: any plant milk will work here. Good creamy replacements for almond milk are unsweetened oat milk and soy milk.