Preheat your oven to 350°F. Lightly grease a 9x13-inch pan.
Place the beets in a blender or food processor and puree until smooth.
In a large mixing bowl, beat or whisk together the brownie mix, eggs, oil and pureed beets. Fold in the chocolate chips.
Pour the batter into your prepared pan and bake as directed on package, but begin checking for doneness at the shortest recommended baking time.
Remove the brownies from the oven and let cool.
Serve slices lightly dusted with powdered sugar, if desired.
Notes
*Package sizes may vary according to brand. This is usually an 18-ounce box. If your package makes an 8x8-inch pan of brownies, then half the remaining ingredients (1/2 jar beets, 1 egg, 2 tablespoons oil, ½ cup chocolate chips).
Chipotle Beet Brownies Option: Stir ½ teaspoon chipotle chili powder into the batter.