I got this recipe from the Eagle Brand website (www.eaglebrand.com). It's is delicious! A great alternative to brownies and blondies, and for those like me who aren't big fans of chocolate but love desserts!
Combine flour, brown sugar and egg; cut in butter until crumbly. Stir in peanuts. Reserving 2 cups crumb mixture, press remaining mixture on bottom of 13x9-inch baking pan. Bake 15 minutes or until lightly browned.
In large bowl, with mixer, beat condensed milk with peanut butter and vanilla. Spread over prepared crust; top with reserved crumb mixture.
Bake 25 minutes longer or until lightly browned. Cool. Cut into bars. Store leftovers covered at room temperature.