Combine sugar with melted butter, eggs, egg yolks, vanilla extract and salt in a large bowl. Whisk until well combined.
Add your flour approximately five to six tbs a time and combine. This will make it easier to blend and will help you avoid flour clumps in the batter and subsequently in the brownie.
Line your baking tray or form with baking paper and add 1/2 of the blondie batter. Spread evenly and bake for 30 minutes at 175C or 350F. This will make it solid enough to add the filling in the next step.
Chop your walnuts roughly, not too small and prepare your salted caramel. There are varioud ways you can make salted caramel make sure you check out our recipe which is super easy and only takes a few minutes.
Evenly distribute the Salted Caramel and Walnuts, then add the remaining blondie batter and distribute evenly with a rubber spatula
Bake for another 45 minutes and then set aside to cool. Once cooled you can easily cut the blondies into equal squares.