I got this recipe from Christie Gardiner who got it from Julie Beck (LDS Relief Society General President) who was my one of her young women leaders in my ward growing up.
Warm slowly in sauce pan till sugar dissolves:
1 c sugar
1 c light karo
After warm add:
2 C creamy peanut butter
Take off of stove and add:
4 C rice krispies
Dump on ungreased cookie sheet.
½ Cup butter
½ Cup Brown Sugar
Remove from heat and add 2 TBS Milk and 1 tsp Vanilla. QUICKLY stir in 2 ½ cups powdered sugar with a wire wisk. Pour over top and spread. Cool and Cut. Makes 4 dozen.