Step 1

In a medium saucepan or a rimmed pan, melt butter over medium-low heat. Add flour and using a whisk, mix until a paste is formed.

Step 2

Slowly pour the oat milk, while whisking constantly to prevent clumps. Then, add salt, black pepper, and nutritional yeast (optional).

Step 3

Stir and bring the sauce to a gentle simmer. Cook for 5-7 minutes over medium-low heat, stirring often, or until the oat milk bechamel thickens and coats the back of a wooden spoon. Keep in mind that the sauce will thicken further as it cools.