Preheat oven to 350°F. Spray a 9×13 pan with nonstick cooking spray or line with parchment paper.
In a medium bowl, whisk together Splenda Magic Baker Sweetener, flour, cocoa powder, sea salt, baking powder, and baking soda. In a separate bowl using an electric mixer, beat together egg, almond milk, and oil. Add the wet ingredients to the dry, and beat on medium speed for 1 minute.
Gently fold coffee into batter. Pour batter into prepared pan.
Bake for 20 minutes, until a toothpick inserted into the center of the cake comes out clean. Remove and let cool.