Easy Queso Dip

(Makes 2 cups )

1 ½ Tbsp unsalted butter
2 Tbsp AP flour
1 c milk, plus up to 4 Tbsp additional
1 ½ c grated cheese (sharp cheddar or whatever...I used maybe 2 c, grated from block)
1/4 to ½ tsp fine salt and cayenne pepper, or to taste (I used sweet butter, added only a little salt)

Melt butter in a small saucepan over medium heat. Add the flour and cook for 1 minute, stirring continuously with a spatula. Whisk in half of the milk (about 1/2 c) and cook until slightly thickened. Then gradually add the rest of the milk and cook until you get a creamy sauce, about 1-3 minutes. Add cheese and stir till melted, then season with salt and cayenne pepper, to taste.