Chili Mac and Cheese

Name: Chili Mac and Cheese
Ingredients: Kosher salt and black pepper; 2 cups (8 ounces) macaroni; 2 tablespoons vegetable oil; 1 small red onion, chopped; 3 cloves garlic, minced; 1/2 red bell pepper, chopped; 8 ounces lean ground beef; 2 teaspoons chili powder; 1 1/2 teaspoons cumin; 1 teaspoon paprika; 1/2 teaspoon dried oregano; One 15-ounce can kidney beans, undrained; One 14.5-ounce can diced tomatoes, undrained; 2 tablespoons tomato paste; 2 tablespoons butter; 2 tablespoons all-purpose flour; 2 cups milk; 4 ounces cream cheese; 2 cups shredded sharp Cheddar, plus extra for garnish; 1 teaspoon Dijon mustard; 1 teaspoon Worcestershire sauce; 3 green onions, chopped; Corn chips, such as Tostitos Scoops, for serving