For The Main For The Topping

1. Preheat the oven to 350 degrees Fahrenheit.
2. Get a greased 13 x 9-inch baking dish, or two 8 or 9-inch round cake pans ready (though the batter might look like it will fit into only one 8 or 9-inch pan, this cake rises very high and will overflow the sides if baked in just one pan).
3. In a bowl, mix the 2 cups of flour, 1-1/4 cups of white sugar, milk, vanilla or almond extract, baking powder, a pinch of salt, and egg (if using) until just combined. Be careful not to overmix.
4. Pour the batter into the prepared baking pan(s).
5. Generously sprinkle brown sugar and cinnamon on top.
6. If you want, sprinkle chopped walnuts or pecans on top.
7. Drizzle melted butter over the top.
8. Bake for about 20-25 minutes for an 8 or 9-inch round cake pan, and about 30 minutes for a 13 x 9-inch pan.