2-1/2 cups Rice Krispies cereal
2 cups uncooked quick-cooking oats
3/4 cup chopped peanuts
1/2 cup firmly packed brown sugar
1/2 cup light corn syrup
1/2 cup creamy or crunchy peanut butter
1 teaspoon vanilla

Combine first three ingredients in a large bowl. Set aside. Stir together brown sugar, syrup and peanut butter in a small saucepan over medium heat, stirring constantly, just until mixture begins to boil and is blended. Remove from heat and stir in vanilla. Pour hot mixture over cereal, stirring until all is coating. Press mixture evenly into a greased 9-inch square pan; let cool completely. Cut into 12 bars. Wrap each bar in plastic wrap and store in an airtight container.

Recipe from the National Peanut Board.