Line a 9-in. square baking pan with parchment, letting ends extend up sides. Place graham crackers and peanuts in a food processor; pulse until just ground. Add sugar; process 10 seconds. Add sweetened condensed milk, vanilla and salt; pulse until dough comes together., Press dough into prepared pan. Refrigerate, covered, at least 4 hours or overnight. Lifting with parchment, remove from pan. Cut into bars. Store in an airtight container.