Mix together the balsamic vinegar, Dijon mustard, vegetable broth, garlic and oregano in a bowl. Add the tempeh/tofu and marinate for at least 20 minutes.
Preheat oven to 350 F.
Add the prepared veggies to a baking sheet lined with parchment paper. Once the tempeh is done marinating, add it to the parchment-lined baking sheet as well. Add the extra marinade to the veggies.
Roast for about 24 to 26 minutes, turning the tempeh and stirring the vegetables halfway through. Top quinoa with roasted tempeh and veggies. Enjoy!