Preheat oven to 350 degrees and grease the loaf pan/muffin tray depending on what you prefer.
In a mixing bowl, combine the eggs, butter, oil, sugar, and vanilla. Mix until smooth.
In a separate bowl, combine the flour, baking powder, baking soda, salt, and pumpkin pie spice.
Add the pumpkin and banana into the egg mixture, mix well.
Slowly add the dry ingredient mixture into the mixing bowl and stir until just combined.
Fold in the chocolate chips if using.
Evenly distribute batter between pans.
Place pans into preheated oven and bake for about 50-60 minutes if making large loaves, 30-35 minutes if mini loaves, and 20-30 minutes if muffins.
Remove from oven once toothpick comes out clean when inserted in center of bread.
Allow to cool slightly before removing from pan and enjoying!