Best-Ever Beef Chili

In a large pot over medium heat, heat oil. Add onion and cook until soft, about 5 minutes. Stir in garlic and cook until fragrant, about 1 minute more, then add tomato paste, stirring to combine. Add ground beef and cook until no longer pink. Drain fat and return to heat. Add chili powder, cumin, oregano, paprika, cayenne (if using), and season generously with salt and pepper. Pour in kidney beans and crushed tomatoes and bring chili to a boil. Reduce heat and simmer 20 minutes. Season with more salt and pepper, if necessary. Ladle into bowls and top with cheddar, sour cream, and green onions.