In a large skillet brown ground beef with onions and 1 tablespoon of chili seasoning.
Transfer browned beef mixture to slow cooker.
Add crushed tomatoes, tomato sauce, kidney beans an 2-3 tablespoons of chili seasoning (depending on how spicy you like it.) Cover and cook on low for 6-7 hours or high 3-4 hours.
Season with salt and pepper before serving.
Served topped with shredded cheddar cheese and green onion if desired.
Click HERE for my recipe for Big Batch Chili Seasoning.