I have been making these squares since my children were little, more than twenty years. They couldn't be any easier to make. They are a great recipe to get the kids involved. They are addictive little devils, so be forewarned! The recipe makes a large pan of squares.
1 cup peanut butter
1/2 cup butter
300g pkg. of semi-sweet chocolate chips
1 tsp. vanilla
400g pkg. of coloured miniature marshmallows
In a medium saucepan melt peanut butter, butter and chocolate. Remove from heat and stir in vanilla and marshmallows. Pour into a greased 9" x 13" baking pan and chill. When completely set, cut into squares. Store in refrigerator. Makes about 35 squares.