Peanut Butter Fudge

1 c. butter
1 lb. light brown sugar
1/2 c. milk
3/4 c smooth peanut butter
1 tsp vanilla extract
1 lb powered sugar

In a medium saucepan, melt butter; stir in brown sugar and milk. Bring to a boil; boil and stir for 23 minutes. Remove from heat; stir in peanut butter and vanilla. Mix in powdered sugar and beat (by hand) with spoon until smooth. Spread into buttered 9 inch square baking pan. Chill until firm. Cut into squares and put in covered container. Makes 3 1/2 pounds