Classic American Chili Mac With Elbows

Name: Classic American Chili Mac With Elbows
Ingredients: 8 ounces elbow macaroni; 2 medium yellow onions, chopped; 3 garlic cloves, finely chopped; 2 tablespoons extra-virgin olive oil; 1 pound ground beef; 1 teaspoon kosher salt; ½ teaspoon black pepper; 1 tablespoon chili powder; 1 tablespoon ground cumin; 3 15-ounce cans kidney beans, drained and rinsed; 2 14 1/2-ounce cans diced tomatoes with chiles; 6 cups low-sodium chicken broth; Shredded cheddar, sliced scallions, and corn bread, for serving