Preheat oven to 325°F.
Using a hand mixer, beat the eggs in a large bowl.
Then add in the pumpkin, oil, melted butter, brown sugar and vanilla extract until smooth.
Mix the dry ingredients together in a medium bowl.
Gradually beat dry ingredients into the wet ingredients until incorporated.
Spray two 8.5 x 4.5 inch loaf pans with non stick baking spray.
Pour batter into prepared pans.
Sprinkle the top with a cinnamon & sugar mixture if desired.
Bake for 65-70 minutes or until a toothpick inserted in the center comes out clean.
Let cool slightly before slicing and serving.
Store in the refrigerator.