Place cream cheese in a small, heat-resistant, non-metallic bowl and heat, uncovered, in Microwave Oven 30 seconds or until cheese is soft.
Add Roquefort cheese, chopped walnuts, mustard and Worcestershire sauce; stir to blend.
Spread cheese mixture on crackers. Arrange a maximum of 10 canapes on a large paper plate or heat-resistant, non-metallic serving platter lined with a paper or cloth napkin.
Heat, uncovered, in Microwave Oven 45 seconds to 1 minute or until cheese begins to melt.
Top with a piece of walnut and serve hot.
Variation: Blue cheese, sharp Cheddar cheese or any strong-flavored cheese may be substituted for the Roquefort cheese.