Taco Spaghetti

Name: Taco Spaghetti
Prep time: 20 min
Cook time: 1 h 15 min
Total time: 1 h 35 min
Cuisine: TexMex
Ingredients: Cooking spray; 1 medium yellow onion; 2 cloves garlic; 1 tablespoon olive oil; 1 pound lean ground beef; 1 1/2 teaspoons kosher salt, divided; 1/2 teaspoon freshly ground black pepper; 1 tablespoon tomato paste; 1/4 cup all-purpose flour; 2 tablespoons chili powder; 2 teaspoons ground cumin; 1/2 teaspoon dried oregano; 2 1/2 cups low-sodium chicken broth, divided; 1 pound dried spaghetti; 2 (10-ounce) cans Ro-Tel diced tomatoes with green chiles; 1 (about 15-ounce) can black beans; 1/2 cup frozen corn kernels; 1 pound Monterey Jack cheese (not shredded); Optional toppings: sliced black olives, diced tomatoes, jalapeño rings, chopped scallions; Chopped fresh cilantro, for garnish (optional)