Preheat the oven and prepare the dish

• Preheat the oven to 180 °C.
• Lightly grease a baking dish.

Make the cake batter

• Combine the cake mix, eggs, melted butter and milk in a bowl.
• Whisk until smooth and no lumps remain.

Add the salted caramel and bake

• Pour the batter into the baking dish.
• Drizzle a little salted caramel over the top.
• Bake until a skewer comes out clean.

Mix the three milks

• Whisk together the sweetened condensed milk, evaporated milk and heavy cream.

Soak the cake

• Let the cake cool, then poke holes all over with a skewer.
• Slowly pour the three-milk mixture over the cake so it absorbs evenly.
• Chill until the liquid is fully absorbed.

Top and serve

• Spread the whipped cream over the chilled cake.
• Drizzle with the remaining salted caramel and sprinkle with flaky sea salt.