Preheat oven to 325F. Grease or line a 8x8x2 metal pan with parchment foil paper.
Using a medium to large saucepan over medium heat, melt butter. Stir frequently as it continues to bubble. When there are small brown specs, and it smells like nutty caramel, remove pan from heat.
Add sugar, cocoa powder and salt to combine.
In separate bowl, beat eggs. After butter mixture has cooled in pot 4-5 minutes, slowly pour eggs into pot with sugar/butter/cocoa powder, stirring constantly until well combined.
Add vanilla and 1 cup beet puree, stir to combine.
Add flour and baking powder, stir to combine.
Add chocolate chunks, stir to combine.
Bake 25-35 minutes in preheated oven or until top no longer looks wet. Enjoy!