In a large bowl, combine flour, brown sugar, baking soda,and salt. Cut in butter until crumbly. Pat into a greased 15x10 inch pan. Bake at 350 degrees for 10-12 minutes or until golden brown.
Sprinkle peanuts and chocolate chips over warm crust. Combine caramel topping and flour; Drizzle over top. Bake 12-16 minutes longer or until golden brown and bubbly. cool on a wire rack. Cut into squares.