Preheat the oven to 355°F (180°C). Lightly grease a 9”x9” (23x23cm) baking pan with vegan butter (or oil). Then line the pan with a strip of parchment paper. Set aside

Combine brown sugar, flour, and pumpkin spice. Mix and set aside.

In a medium-size bowl, combine all-purpose flour, brown sugar, chopped pecans, pumpkin spice, and a pinch of salt. Add cold vegan butter cut into chunks, and combine with a fork until it starts to clump. Set aside.

To a medium-size bowl, add all-purpose flour, baking powder, baking soda, pumpkin spice, and a pinch of salt. Mix with a whisk and set aside.

In a large bowl, using a whisk, combine granulated sugar, sunflower oil, pumpkin puree, and vegan sour cream. Then add in unsweetened almond milk and apple cider vinegar and mix well. Sift in the flour mixture and mix everything with a spatula until incorporated. Don’t overmix the batter.

Spread half of the batter into an even layer in the prepared pan. Sprinkle the pumpkin spice sugar mixture over the first layer. Add in the remaining batter and spread it into an even layer. Then top with pecan streusel.

Bake in preheated oven for 30 minutes, or until the toothpick inserted in the middle comes out clean. Remove from the oven and transfer to a cooling rack to cool completely.

For the glaze, whisk together powdered sugar and almond milk until a smooth consistency without any lumps. Add a little extra milk or powdered sugar as necessary.

Then when ready to serve, gently remove the cake from the pan, drizzle with glaze, and cut it into 9 squares.

Serve and enjoy!