Preheat oven to 350°. Line a 15x10x1-in. baking pan with foil; grease foil. In a small saucepan, melt butter over medium heat. Stir in brown sugar, rosemary and thyme. Add nuts; toss to coat. Spread into prepared pan. Bake 10-12 minutes or until toasted.
Immediately transfer to waxed paper; cool completely. Store in an airtight container.