Transfer batter to baking dish. Press to spread around baking dish. Bake for 15 minutes.
In a medium saucepan on low heat, melt 2 tablespoons butter with sweetened condensed milk. Stir until thickened, remove from heat and add vanilla. Pour sauce over top of baked crust. Return to oven and bake until golden brown, 8-10 minutes.
Toast nuts in a dry pan until fragrant. Cool slightly then rough chop and set aside.
Melt caramel chips in microwave with 4 tablespoons heavy cream; 30 second intervals, stirring each time, for 2 minutes. Fold nuts and salt into caramel sauce, and pour over top and spread out to edges. Cool completely before cutting into bars.
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