Preheat your oven to 350°F (175°C).
Grease an 8x8-inch baking dish or a similar-sized pan.
Place the chopped dates in a bowl and cover with boiling water. Stir in the baking soda and let it sit for 10 minutes to soften.
In a large bowl, whisk together the flour, granulated sugar, dark brown sugar, cocoa powder, baking powder, and salt.
In another bowl, mix the applesauce, melted coconut oil, plant-based milk, and vanilla extract.
Add the wet ingredients to the dry ingredients and mix until just combined.
Stir in the softened dates along with their soaking liquid.
Pour the batter into the prepared baking dish and spread evenly.