Skillet Chili Mac

Name: Skillet Chili Mac
Ingredients: 12 ounces whole-wheat elbow noodles, rotini or fusilli; 2 tablespoons extra-virgin olive oil; 1 large onion, diced; 2 medium poblano peppers and/or green bell peppers; 1 medium stalk celery, diced; 3 cloves garlic, minced; 1 pound lean ground beef; 3 tablespoons chili powder; ½ teaspoon salt; 1 (28 ounce) can diced tomatoes; 1 cup low-sodium beef broth; 1 (15 ounce) can low-sodium kidney beans or chili beans, rinsed; ½ cup sour cream; ¾ cup shredded sharp Cheddar cheese; Sliced scallions and/or pickled jalapeños for garnish