Preheat your oven to 350 degrees F. Grease a 9x5 inch loaf pan well and line it with a strip of parchment paper so you have handles on both long sides. This makes it much easier to lift the finished loaf out without disturbing that cream cheese layer.

Make the cream cheese filling first. Beat the softened cream cheese, 1/4 cup granulated sugar, 1 egg, and vanilla extract together with a hand mixer until completely smooth and fluffy, about 2 minutes. Set it aside.

Whisk the flour, baking soda, baking powder, salt, cinnamon, ginger, nutmeg, and cloves together in a large bowl. In a separate bowl, whisk the pumpkin puree, 3/4 cup granulated sugar, brown sugar, 2 eggs, vegetable oil, and milk until well combined and smooth.

Pour the wet pumpkin mixture into the dry ingredients and stir with a rubber spatula just until no dry flour streaks remain. Do not overmix or the loaf will be tough. Fold in the chopped walnuts gently.

Spread half of the pumpkin batter evenly into the prepared loaf pan. Spoon the cream cheese filling down the center of the batter in a thick ribbon, keeping it away from the edges by about half an inch on each side. This helps it stay suspended in the middle rather than sinking.

Drop the remaining pumpkin batter by spoonfuls over and around the cream cheese layer, then use your spatula to gently spread it to cover the filling completely. Do not stir or swirl. You want a true ribbon, not a marble.

Bake for 60 to 70 minutes, until a toothpick inserted into the pumpkin portion (not the cream cheese center) comes out clean or with just a few moist crumbs. The top will be deep golden brown with a natural crack running down the center. If the top is browning too fast after 45 minutes, tent loosely with foil.

Let the loaf cool in the pan for 15 minutes, then use the parchment handles to lift it out onto a wire rack. Cool for at least 30 more minutes before slicing. Cutting too early will cause the cream cheese layer to smear rather than slice cleanly.