In medium size saucepan, over low heat, cook brown sugar and butter, stirring constantly for 2 minutes.
Add the evaporated milk and continue, stirring, until mixture boils. Remove from heat and let it cool.
Butter a small square pan and set aside. When cooled, add the powdered sugar and stir well with a wooden spoon until it reaches the consistency of fudge. Add the nuts. Then press into the buttered pan. Chill. Cut into squares and eat. Sooo good!!