Melt butter in large pot ... to make white sauce, stirring frequently to ensure ... until warm. Add cheeses, stirring well to incorporate. ... your choice of pasta.
Preheat oven to 350°F. Warm ... 1/4th cup shredded cheese and 2 tablespoons of onion, ... stir until the sauce bubbles and starts to thicken. ... in them as well.
Blend ingredients in blender, food ... whisk. Basic white sauce consists of the first 4 ingredients. Cheese sauce is simply white sauce ... stirring until bubbling smooth.