1. Preheat oven to 350°F (175°C). Grease or line a 9×13-inch baking pan with parchment paper.

2. In a medium bowl, whisk together flour, baking soda, salt, cinnamon, nutmeg, and cloves.

3. In a large bowl, whisk pumpkin puree, oil, eggs, vanilla extract, and sugar until smooth.

4. Fold the dry ingredients into the wet ingredients until just combined.

5. In a small bowl, use a pastry cutter or fork to combine butter, flour, brown sugar, and cinnamon until crumbly.

6. Spread the batter into the prepared pan and sprinkle the streusel evenly over the top.

7. Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean and the streusel is golden.

8. Cool on a wire rack for at least 20 minutes before slicing.