1. Preheat oven to 350 degrees Fahrenheit. Grease and ﬂour a cookie sheet.
2. Remove from heat. Stir in cashews, ﬂour, and vanilla extract. Drop batter in half-teaspoon mounds, two inches apart, onto prepared cookie sheet. Using a small spatula, spread each mound into a circle.
3. Bake for eight to 10 minutes or until browned, rotating pan back to front every four minutes. Remove from oven and cool on cookie sheet for 30 seconds, then transfer crunches to wire rack to cool. Allow to cool completely.
4. In a small saucepan, melt margarine over medium heat. Add brown sugar and corn syrup and bring to boil, over medium heat, stirring constantly, until sugar dissolves, three to five minutes.