Melt butter in small saucepan. If using chopped veggies add now and saute until softened
Combine flour and bouillion powder and sprinkle over butter. Whisk, cooking for a minute or two to ‘cook’ the flour.
Gradually stir in the milk, whisking to disperse any lumps and cook until thickened. At this point you can add chopped or shredded chicken or cheese if using.
If adding vegetables I suggest about 1/2 - 3/4 cups, chopped. I like to saute them in the butter first before adding the flour. Try chopped celery, mushrooms, broccoli or cauliflower.If making cream of chicken soup, stir in chopped or shredded cooked chicken at the end, once the mixture has thickened.Try adding shredded cheese of your choice for making cheesy cream of broccoli or cauliflower soup. Aged cheddar or gruyere are especially nice.