How to Make It
Make the batter:
Preheat oven to 350°F. Lightly coat 3 8-by-4-inch loaf pans with nonstick spray. Whisk flour, baking powder, cinnamon, ginger, cloves, and salt in a large bowl. Whisk brown sugar, granulated sugar, pumpkin, oil, eggs, and vanilla in a separate large bowl until smooth. Make a well in the center of dry ingredients and add sugar mixture. Starting from the center, stir until blended. Divide evenly among prepared pans.
Make the streusel:
Whisk flour, sugar, pepitas, and salt in a small bowl. Add butter; stir with a fork until mixture is crumbly. Sprinkle evenly over batter in pans.
Bake until loaves are golden and a toothpick inserted in the centers comes out clean, 55 to 70 minutes. Remove from oven; let loaves cool in pans for 10 minutes. Remove loaves from pans and transfer to a wire rack. Let cool completely, about 1 hour. Slice and serve.
Wrap each cooled loaf in plastic wrap and then in foil. Freeze for up to 3 months. Thaw, unwrapped, at room temperature for 3 to 4 hours.