Start by preheating your oven to 350°F and lightly greasing a square 9x9-inch baking pan.
In a large mixing bowl, melt your butter and let it cool slightly before whisking in the pumpkin puree, brown sugar, white sugar, eggs, vanilla extract, and Greek yogurt until the mixture is smooth and well combined.
1/2 cup Butter, 1 cup Pumpkin Puree, 1/2 cup Brown Sugar, 1/2 cup Granulated Sugar, 2 eggs Eggs, 2 tsp. Vanilla, 1/2 cup Greek Yogurt
In a separate bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, nutmeg, ginger, and clove.
1&3/4 cup Flour, 1 tsp. Baking Soda, 1 tsp. Baking Powder, 1/4 tsp. Salt, 1&1/2 tsp. Cinnamon, 1/2 tsp. Nutmeg, 1/2 tsp. Ground Ginger, 1/4 tsp. Ground Clove
Gently fold the dry ingredients into the wet mixture, stirring just until everything is incorporated—be careful not to overmix so your cake stays tender.
Pour the batter evenly into your prepared pan and smooth out the top. Next you'll be putting the crumble top before the oven.