Preheat your oven to 350°F. Grease a 10-inch Bundt pan with Baker's Joy or a homemade version, and set it aside.
In a large mixing bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
In another bowl, blend the eggs, mashed bananas, sugar, and oil (or melted butter) until smooth.
Gradually add the wet ingredients to the dry, stirring until just combined—don’t worry if the batter is a little lumpy. If you're adding nuts, fold them in gently.
Transfer the batter to the prepared Bundt pan, spreading it evenly.
Bake for 55-60 minutes, until a toothpick inserted into the center comes out clean.
If the cake is browning too quickly, cover it loosely with foil for the last 15 minutes.
Let the cake cool in the pan for 10 minutes before flipping it out onto a wire rack.
Enjoy warm or let cool and wrap tightly for later.
Dust with powdered sugar if desired.