Skillet Chili & Meatballs

Name: Skillet Chili & Meatballs
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: 2 lb. ground beef (preferably 90/10); 2 large eggs; 1 c. panko bread crumbs; 1/4 c. fresh cilantro leaves, chopped; 3 tsp. chili powder, divided; Kosher salt; Freshly ground black pepper; 2 tbsp. extra-virgin olive oil; 1 small red onion, finely chopped, about 1 tbsp. reserved for serving; 1 (15-oz.) can black beans, drained and rinsed; 1 (15-oz.) can diced tomatoes with juices; 1 (15-oz.) can kidney beans, drained and rinsed; 1 (4-oz.) can mild green chiles with juices; 1 c. water; 1 tbsp. tomato paste; 1 tsp. ground cumin; 1/2 tsp. garlic powder; 1 1/2 c. shredded Mexican blend cheese (about 6 oz.); Sour cream, guacamole, cilantro, and tortillas chips, for serving