Heat oven to 350°F. Line an 8×8-inch square baking pan with parchment or foil, extending it up two sides. Set aside.

In a double boiler (or a medium heatproof bowl sitting halfway into a saucepan with simmering water—just make sure the bottom of the bowl doesn't touch the water!), melt cacao butter and butter together. Add cacao powder and whisk until combined.

Remove the bowl from the heat and whisk in sugar, then eggs one at a time, then vanilla and salt. Stir in flour with a spoon or spatula. Scrape the batter into your prepared pan and spread until it's evenly distributed.

Bake for 25 to 30 minutes, or until a toothpick inserted into the center comes out batter-free.

Let cool completely, then cut into desired size. Enjoy!

Submitted by Team Navitas, adapted from a recipe by Smitten Kitchen