Mix karo syrup and sugar. Microwave 3-4 minutes. Add 1 cup peanuts. Mix and microwave 3-5 minutes. Add butter and vanilla. Mix and microwave 1 minute. Add and mix baking soda immediately. Coat a cookie sheet with cooking spray. Spread onto a cookie sheet. Allow to cool, then break into pieces. Store in ziplock bag or tin. Great to give as a gift.