Lightly grease the pan (loaf pan, mini loaf pan, 8x8-inch or 9x9-inch square pan, round pan) with some butter. Mix the flour and the baking powder together and sieve. Add in the salt and mix well. Set aside.
Pour the batter into the greased baking pan. Shake it lightly to distribute the cake batter evenly. Bake until golden brown and cooked, about 40 - 50 minutes. To prevent the top of the cake from over browning, cover the top of the baking pan with a sheet of aluminum foil once the cake top is set. Use a cake tester to test doneness.