Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease and flour a 9x13-inch baking dish or a bundt pan.
Mix the Dry Ingredients:
In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, ginger, nutmeg, cloves, and salt. Set aside.
Mix the Wet Ingredients:
In a large mixing bowl, beat the granulated sugar, brown sugar, and softened butter together until light and fluffy.
Add the pumpkin puree, eggs, and vanilla extract, mixing until well combined.
Stir in the sour cream until fully incorporated.
Combine Wet and Dry Ingredients:
Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix.
Bake the Cake:
Pour the batter into the prepared baking dish or bundt pan, smoothing the top with a spatula.
Bake for 40–50 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for about 10 minutes, then transfer it to a wire rack to cool completely.
Make the Brown Butter Glaze:
In a medium saucepan over medium heat, melt the butter. Continue cooking until the butter turns a golden brown color and has a nutty aroma, about 5–7 minutes. Be careful not to burn it.
Remove from heat and let it cool slightly. In a mixing bowl, whisk in the powdered sugar, vanilla extract, and enough milk to achieve your desired glaze consistency.
Glaze the Cake:
Once the cake has cooled completely, drizzle the brown butter glaze over the top, allowing it to drip down the sides.