Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
Mix dry ingredients: In a bowl, whisk together flour, baking soda, baking powder, salt, cinnamon, nutmeg, and cloves.
Combine wet ingredients: In another bowl, beat eggs, oil, brown sugar, granulated sugar, pumpkin puree, and vanilla until smooth.
Combine mixtures: Gradually fold the dry ingredients into the wet ingredients until just combined. Avoid overmixing. Stir in chocolate chips/nuts if using.
Bake: Pour batter into the prepared loaf pan. Bake for 55–65 minutes, or until a toothpick inserted in the center comes out clean.
Cool: Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.
