1. Preheat oven to 350°F (175°C). Grease or line a 9×5-inch loaf pan.

2. Whisk flour, baking soda, baking powder, salt, cinnamon, nutmeg, and cloves.

3. In another bowl, whisk pumpkin, granulated sugar, brown sugar, eggs, oil, and vanilla until smooth.

4. Fold wet ingredients into dry just until no flour streaks remain; do not overmix.

5. Stir in optional chocolate chips or nuts, if using.

6. Scrape batter into pan and smooth the top.

7. Bake 55 to 65 minutes, or until a toothpick inserted in the center comes out clean.

8. Cool 10 minutes in pan, then transfer loaf to a rack to cool completely.

9. Slice and serve plain, with butter, or cream cheese.

10. Store airtight at room temperature up to 3 days, or freeze slices up to 3 months.