Steps
1. Drain the soaked cashew nuts and blend them with the oat milk until smooth.
2. In a saucepan, melt margarine over medium heat.
3. Whisk in the flour and cook for 1-2 minutes to form a roux.
4. Slowly pour in the cashew-oat milk mixture, whisking continuously to avoid lumps.
5. Add nutritional yeast flakes, nutmeg, salt, and pepper.
6. Continue to cook and stir until the sauce thickens to a creamy consistency.
7. Remove from heat and use immediately in your moussaka.