Preheat your oven to 350°F (175°C). Line a square baking pan (about 9x9 inches) with parchment paper. Make it so flaps hang over two sides (making the bars easier to remove).
Prepare the base layer. In a bowl, whisk together almond flour, brown sugar, baking powder, salt, and cornstarch. Pour in the melted vegan butter and 1 tbsp of plant-based milk of choice and mix until combined.
1 3/4 cups super fine almond flour, 1/3 cup packed brown sugar, 1/4 cup melted vegan butter, 2 tbsp cornstarch, 1 tbsp plant-based milk, 1/4 tsp salt, 1/2 tsp baking powder
Press the mixture into the bottom of the prepared baking pan to form an even base layer. Bake for 10 minutes. While it is baking, make your gingerbread filling.
Prepare the gingerbread filling. In a separate bowl, whisk together molasses, almond butter, and maple syrup. Sprinkle in your almond flour and spices. Mix until well combined.
1/4 cup molasses, 1/4 cup maple syrup, 1/2 cup almond butter, 1/4 cup almond flour, 1/2 teaspoon ground ginger, 1/2 teaspoon ground cinnamon, 1/4 teaspoon ground nutmeg, 1/4 teaspoon ground cloves
Remove your base layer from the oven. Spread the gingerbread filling evenly over the base layer in the baking pan using a rubber spatula.Bake again for 15 minutes. There will be some soft bubbles on the gingerbread layer, but it's not fully set yet. Let it cool on the counter for 10 minutes before placing in the freezer for ~30 minutes until the bars are completely cooled.
Prepare the frosting: While the gingerbread bars are cooling, prepare the topping. In a large mixing bowl, beat the vegan butter until creamy. Add powdered sugar, plant-based milk, and vanilla extract. Beat again until smooth and creamy.
6 tbsp vegan butter*, 1 cup powdered sugar, 1 tablespoon plant-based milk, 1/2 teaspoon vanilla extract
Once the bars are completely cooled, spread the frosting evenly over the gingerbread layer. *If you frost warm bars, the frosting will melt off.
Place the pan in the refrigerator for at least 1 hour to allow the frosting to set with the bars.
Once fully chilled and set, lift the bars out of the pan using the parchment paper. Optional: Dust with some cinnamon for a nice touch. Cut into squares. Enjoy!