1 stick butter
1 lb. light brown sugar
1/2 c. milk
3/4 c. peanut butter (smooth or crunchy)
1 tsp. vanilla
1 lb. powdered sugar

In medium saucepan melt butter. Mix in the brown sugar and milk. Bring to a boil. Stir and boil for 2 minutes. Remove from heat and add peanut butter and vanilla. Add powdered sugar and beat until smooth. Spread into a buttered 13x9-inch pan. Chill until firm. Cut into squares.