Preheat the oven to 350°F and lightly coat a 9x13 baking dish with cooking spray or vegetable shortening.
Place the drained beets to a food processor. Pulse until they make a a mixture similar to applesauce.
In microwave, heat the chocolate until melted. Add to the food processor and pulse until combined with the beets. Transfer the mixture to the bowl of a stand mixer fitted with a paddle attachment or a large mixing bowl.
Add the sugar, eggs, oil and vanilla to beet and chocolate mixture. Blend until fully combined.
Sift together the flour, baking soda and salt and add to the wet ingredients in 3 increments. Do not overmix.
Evenly spread the cake batter into the bottom of the prepared baking dish. Bake for 25-30 minutes, or until the cake passes the toothpick test.
Remove and allow to cool. Directly before serving, garish with powdered sugar.
If you've tried this recipe, come back and let us know how it was in the comments or star ratings.