Mix all the ingredients thoroughly in a bowl. Store in an airtight container in a cool, dry place.
When ready to cook, measure out ¼ cup mix and add it to a saucepan over medium heat. Stir in 2 tablespoons melted butter and 1 cup milk or water depending on your preference or dietary needs. Whisk continuously. Bring the mixture to a gentle boil, continuing to stir constantly to avoid scorching. Cook until the mixture thickens to your desired consistency, then remove from heat and use as needed.
