Melt butter, add sugar, flour, & nuts together. will be stiff. spread evenly into 9x13 pan. bake at 350 degree for 20-25 min. set aside.
Mix butter, sugar, syrup & sweetened condensed milk in a saucepan. bring to boil on low-med heat stirring occasionally. after mixture comes to boil stirring continually, boil until it starts to thicken & becomes amber colored, Pour over cooked crust.
Sprinkly choc. chips over hot caramel mixture, then sprinkly chopped nuts on top. Chill & enjoy!!