1. Mix together the corn syrup, salt, peanuts, and sugar in a one- and- a- half-quart microwaveable bowl. Microwave for four minutes. Stir. Microwave another three minutes. Add the margarine and vanilla. Microwave for one to three minutes, watching carefully so that it doesn’t burn, until caramel colored. Add the baking soda and mix together.
2. Pour onto greased cookie sheet and flatten. Cool well and break into pieces.