3 T. oil, butter, or a mix
3 T. flour
2 c. milk or cream
1/2 t. salt, or to taste
1/4 t. pepper (white if you don't want the black specks to show), or to taste
Heat the butter or oil in a skillet over medium low heat. Add the flour, stirring with a wire whisk. In a microwave oven, or in a separate small pan on the stove, warm the milk. (You can skip this step if your skillet is very large, allowing the temperature of the milk to rise immediately.) Slowly whisk in the milk, raise the heat, and stir constantly until the mixture comes to a boil and thickens. Cook for 1 minute more. Season with salt and pepper.
If you want to have a basic savory sauce, add a small onion with the oil and cook until the onion is clear. Proceed with recipe.