Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, and grease and line a 9" square tin
Melt the dark chocolate and butter together in a pan on a low heat. When fully melted, stir together and remove from the heat. Let it cool for 5 minutes
In a mixing bowl use an electric mixer to whisk together the eggs, light brown soft sugar and vanilla extract for 5 minutes until thicker and paler in colour
Add the chocolate mixture to the egg mixture, whisking constantly as you pour it in
Add the plain flour and whisk in gently with a hand whisk until you can't see any more flour
Pour the batter into the lined traybake tin and bake for 15 minutes. Remove from the oven and set aside
To make the pecan pie topping, mix together the maple syrup, light brown soft sugar, eggs, vanilla extract, salt and melted butter
When the mixture is thick and syrupy, add the chopped pecans and stir until they are all coated
Gently spoon the pecan pie topping evenly all over the brownies
Bake for a further 20-25 minutes, or until the pecan pie topping is golden all over with a slight jiggle. Allow to cool fully and put in the fridge for at least 2 hours before removing from the tin and slicing
Store leftovers in an airtight container in a cool place and eat within 3 days
Video
Notes
Make sure your eggs are at room temperature before you start baking. The butter can be cold for this recipe, as you are going to melt it anyway. It will just take slightly longer to melt.
You can replace the light brown soft sugar with caster sugar or granulated sugar if you prefer, or if that's all you have.
If you don't want to use maple syrup for the pecan topping, you can also use golden syrup, honey or agave nectar.
I used unsalted block butter for this recipe, not a baking spread or margarine.
For all of the answers to more questions about brownies, check out my Chocolate Brownies guide!
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50).
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.