Roasted Veggie and Black Bean Tacos

Name: Roasted Veggie and Black Bean Tacos
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: American
Ingredients: 3 medium tomatoes (, cored and seeded, diced* (1 1/2 cups)); 2 ears corn (, kernals cut from cob (1 1/2 cups)); 1 medium zucchini (, diced (1 1/2 heaping cups)); 1 medium yellow squash (, diced (1 1/2 heaping cups)); 3/4 small yellow onion (, chopped (scant 1 cup)); 1 red bell pepper (, diced (1 cup)); 1 1/2 Tbsp olive oil; 1 1/2 Tbsp canola oil; 1 tsp cumin; 1 tsp chili powder (, divided); Salt and freshly ground black pepper; 1 cup canned black beans (, drained, rinsed and warmed); 1/3 cup cilantro (, chopped); 1 1/2 Tbsp fresh lime juice; 10 Corn tortillas; Queso fresco (, for serving (optional)); Sour cream and Mexican hot sauce for serving ((optional))