Chili Cornbread Casserole

Name: Chili Cornbread Casserole
Cook time: 1 h
Total time: 1 h
Cuisine: American, TexMex
Ingredients: 1 pound lean ground beef; 1/2 teaspoon garlic powder; 1/2 teaspoon onion powder; kosher salt and freshly ground pepper, to taste; 1 cup salsa; 1 (15.25 oz.) can kidney beans, rinsed and drained; 1 (14.5 oz.) can diced tomatoes; 1 cup corn; 1/2 tablespoon chili powder; 1 teaspoon cumin; 1 (8.5 oz.) box cornbread muffin mix; 1/3 cup whole milk; 1 cup sharp cheddar cheese, grated, divided; 1 green onion, finely chopped, garnish, optional