Preheat the oven to 180℃ fan/200℃/Gas Mark 6/400F.
Line a baking tray with baking paper (I used a 25x25cm tin).
Melt the butter, sugar, milk and dark chocolates together over a very low heat.
Once they are melted remove from the heat and leave to cool for 5-10 minutes.
Beat in the eggs and flour.
Pour your mixture into the tin and smooth out with a spatula.
Bake for 30 - 40 minutes, or until the edges are just solid but the middle still has a little wobble. Don't overbake them!
Ovens do vary so don't be alarmed if you recipe takes that little bit longer. Brownies are better under-done than over.
When they come out of the oven, pour over the caramel (see recipe notes). Smooth out and pop into the fridge for at least an hour.
Sprinkle with sea salt and cut into squares.
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