Brownies from scratch

These are the soft moist brownies, not the fudge kind.

1 3/4 cup sugar ]
2 sticks butter   ]       cream
4 eggs                         mix
1 cup flour
4 tablespoons cocoa
1/2 teaspoon baking powder
2 teaspoon vanilla
1 cup pecans (optional)

Bake at 350° for 34 minutes.