1 large onion, coarsely chopped
1 lb ground lean beef
1/3 cup plain dried bread crumbs
1 large egg
4 tsp chili powder
3/4 tsp ground cumin
1/2 tsp salt
1 large red bell pepper, coarsely chopped
1 1/2 cups frozen corn, thawed
3 cups low-sodium chicken broth
1 can (15-oz) tomato sauce
1 can (14 1/2-oz) diced tomatoes with green chiles
1 zucchini, cut lengthwise in half, then thinly sliced
1 lime, cut into 6 wedges
Preheat oven to 425 degrees. Lightly spray large rimmed baking sheet with nonstick spray.
Set aside 3/4 cup of the chopped onion.
In a large bowl, combine beef, bread crumbs, remaining onion, egg, 3 teaspoons chili powder, cumin, and salt to mix well. Form the beef mixture into approximately 30 meatballs. Place the meatballs on the baking sheet and bake until lightly browned, about 10 minutes.
While meatballs bake, combine the reserved onion, bell pepper, corn, broth, tomat sauce, tomatoes, and the last teaspoon of chili powder in the crockpot or slow cooker. Stir in the meatballs, cover, and cook 4 to 6 hours on high or 8 to 10 hours on low.
Approximately 20 minutes before serving time, add the zucchini to the pot. Cover and cook until tender.
Serve with the lime wedges.