Caramel-Walnut Brownies

1 (14oz) package caramels
2/3 C evaporated milk, divided
1 (18.25oz) package caramel flavored cake mix
3/4 C butter, melted
2 tsp vanilla extract
3/4 tsp ground cinnamon
1 1/2 C walnut halves or pieces

Preheat oven to 350. Unwrap caramels and place in medium saucepan. Add 1/3 cup evaporated milk; cook over low heat until caramels melt, stirring often. Remove from heat; set aside. Combine remaining 1/3 cup milk and next 4 ingredients; stir until just blended. Spread half the dough into lightly greased 9" square pan. Chill remaining dough. Bake 350 for 10 minutes. Cool in pan on wire rack 5 minutes. Pour caramel mixture over brownie layer in pan. Sprinkle with walnuts. Divide remaining dough into 9 portions. Pat each portion into a 3" circle. Place circles over walnuts in pan, overlapping slightly. Bake at 350 for 25 minutes. Cool completely in pan on wire rack. Cover and chill thoroughly before cutting.