Preheat the oven to 350°F (175°C). Grease and line a 9-inch round cake pan.
In a mixing bowl, whisk together flour, baking powder, spices, and salt.
In another bowl, combine pumpkin puree, almond milk, maple syrup, oil, and vanilla.
Add the wet ingredients to the dry and stir until just combined.
Pour the batter into the prepared pan.
In a small bowl, mix the brown sugar, melted coconut oil, and cinnamon for the topping.
Sprinkle the topping evenly over the cake batter.
Bake for 35–40 minutes, or until a toothpick comes out clean.
Let the cake cool before serving (if you can wait that long).