Preheat the oven to 350°F (175°C).
Grease your 9x13-inch baking dish.
Combine almond flour, baking powder, cinnamon, nutmeg, and salt in a medium bowl.
In a large bowl, beat eggs, pumpkin puree, melted butter, sweetener, and vanilla extract until smooth.
Gradually add the dry ingredients to the wet ingredients and mix well.
Pour the batter into the prepared pan and bake for 25-30 minutes, or until a toothpick comes out clean.
Cool the cake for 10 minutes. Poke holes in the cake with a skewer or fork.
Mix heavy cream and softened cream cheese together, then add sweetener and mix until smooth.
Spoon the creamy filling into the holes of the cake.
Refrigerate the cake for at least 2 hours.
Serve with whipped cream or cinnamon if desired.