5 oz. (10 Tbs.) very soft unsalted butter; more for the pan
1-2/3 cups granulated sugar
2 large eggs, at room temperature
1 tsp. pure vanilla extract
1/2 tsp. table salt
7-1/4 oz. (1-1/2 cups plus 2 tablespoons) unbleached all-purpose flour; more for the pan
2-1/2 oz. (1/2 cup plus 1/3 cup) unsweetened natural cocoa powder (not Dutch-processed)
1 tsp. baking soda
1 tsp. baking powder
1-1/2 cups good-quality brewed coffee, cooled to warm