1. Blend cheese, butter, flour, and cayenne pepper until smooth. Divide mixture in half and place on two sheets of wax paper. Roll up to form 2 6-inch logs. Refrigerate until firm.
2. Unwrap logs and roll in chopped walnuts to coat. Cut each log into 24 1/4-inch pieces. Arrange 12 pieces in a circular pattern on a paper plate. Microwave at Cook Cycle 1 (power level 5) for 4 to 5 minutes. Let stand 1 minute before removing from plate with spatula. Repeat procedure with remaining pieces.