Here's my go to recipe and the best I've ever had. The Brown sugar ads depth to the flavor:
Real Deal Brownies
8 ounces melted butter
1 1/4 cups cocoa pwd (I prefer a blend of dutched and undutched),
1 cup sugar
4 large eggs
1 cup brown sugar,
2 teaspoons vanilla extract
1/2 cup flour, sifted
1/2 teaspoon salt
Optional addition - chopped nuts
Oven: 300 Butter and flour an 8-inch square pan.
Melt butter in a small pan and mix in cocoa powder and 1 C white sugar, stir to dissolve. Set aside to cool a bit.
In a mixer beat eggs at medium speed until fluffy and light yellow.
Add Brown sugar and mix.
Add butter mixture and the rest of the ingredients and mix to combine. Do not over mix.
Pour the batter into a greased and floured 8-inch square pan and bake for 45 minutes. Check for doneness with a toothpick inserted into the center of the pan. (should come out clean).
When it's done, cool on a rack. Prepare glass of cold milk while you wait for it to cool....
Note if you like thinner brownies, use a larger pan - this makes a THICK brownie.
This recipe is very similar to Kate Hepburns Brownies but doubled and with the addition of brown sugar. The brown sugar makes a BIG difference in flavor