Well in Sweden most Brownies recipes are hard crust and chocolate in it.
Here is the kladdkaka recipe I use the most.
100 gram butter
300 ml sugar
4 tablespoon of unsweetened cocoa powder.
150 ml flour
½ tablespoon vanilla
1 tablespoon liquid, water, booze, coffee or juice
1 pinch salt
Heat the oven up to 150C. Find a round pie tin , 20-24 cm wide., Melt butter, add salt och cocoa, whisk smooth, leave. In a separate bowl whisk egg, sugar and vanilla fluffy, but not pale. Stir in flour and the the cocoa/butter . Stir in the liquid and pour the batter into the pie tin and bake in the middle of the oven for 28 minutes.
Leave to cool for 1 hour, then serve pie slices with ice cream. But for a better taste leave it in the fridge 12-24 hours and then pipe roses of whipped cream and serve with fruit.
Every one will get a harder crust and a gooie center this way.
proper kladdkaka isnt served in squares.