Bring the butter to room temperature or microwave for 20 seconds to soften. Bring the eggs to room temperature. Sift the ◆ dry ingredients. Preheat the oven to 180 ℃.
Combine the butter and sugar into a bowl and mix well until the grains are gone. Add the eggs one at a time and mix well.
Add the sifted ◆ dry ingredients and mix until it's no longer powdery. Then add the chocolate and the chestnuts cut into 1 cm cubes, and mix.
Line a pan with parchment paper and pour in the mixture from Step 3. Bake in a preheated oven at 180 ℃ for about 20 minutes.
Cut into pieces of your desired size and enjoy.
Story Behind this Recipe
Brownie recipes usually melt the chocolate, but I thought it'd be nice to have chunks.
Aside from a square pan, you can also use a muffin or pound cake pan. Cut the chocolate and chestnuts into large chunks and enjoy eating. It's delicious eaten right after baking, but if you wait and eat the next day, it's even more delicious.