I love this recipe for brownies, but you will notice that I have several on this site. My favorite brownie recipe changes all the time.

1 cup butter, melted
3 cups white sugar
1 tablespoon vanilla extract
4 eggs
1 1/2 cups all-purpose flour
1 cup unsweetened cocoa powder
1 teaspoon salt
1/2 teaspoon baking powder
1 cup high-quality semisweet chocolate morsels (I used baking chocolate squares, roughly chopped)
1/4 to 1/2 chocolate chips (I use the mini semi-sweet chocolate chips)

Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9 x13 baking dish. Combine the melted butter, sugar, & vanilla in a large bowl. Beat in the eggs, one at a time, mixing well after each, until thoroughly blended. Sift together the flour, cocoa powder, baking powder& salt. Gradually incorporate the dry ingredients into the wet ingredients until blended. Stir in the chocolate morsels. Spread the batter evenly into the prepared baking dish. Sprinkle the mini chocolate chips over the top of the batter. Bake in preheated oven until an inserted toothpick comes out clean, the original recipe says 35 to 40 minutes, but I am baking for them 30 minutes and they are coming out perfectly. (Ovens vary and it is so easy to over bake brownies and have them turn out dry. I test mine after 30 minutes and if the surface looks cooked and the center is firm I take them out). Remove, & cool pan on wire rack before cutting.