Veggie enchiladas with sour cream sauce

Name: Veggie enchiladas with sour cream sauce
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: American, Mexican
Ingredients: 1 Tablespoon butter for greasing pan; 2 Tablespoons olive oil; 4 medium carrots, diced; 1 large red onion, diced; 2 medium broccoli crowns, roughly chopped (florets only); 1 Tablespoon water; 5 ounces frozen corn; 1 15 ounce can black beans, drained and rinsed; 1 Tablespoon fresh lime juice; 1/2 teaspoon salt; 2 cups shredded colby jack cheese; 8 8" flour tortillas; 1/4 cup flour; 1/4 cup butter; 2 cups vegetable broth; 2 Tablespoons minced sun dried tomatoes; 1 4 ounce can green chiles; 1 cup sour cream; 1/2 teaspoon ground cumin; Avocado, lime, cilantro, and pico de gallo for serving