Cut and prepare the asparagus, peppers, kielbasa, and tomatoes.
Combine asparagus, peppers, and kielbasa in a bowl, and stir in about a 1/2 tablespoon avocado oil.
Blend sea salt, Italian seasoning, paprika, garlic powder, and black pepper together.
Add seasonings into the asparagus, peppers, and kielbasa mixture.
Pour the mixture in the air fryer basket and cook for 12 minutes at 380°F/193°C, stirring half way through cooking. Add tomatoes and cook for 2 minutes more if desired.