Preheat oven to 330°F.
In a large skillet on low to medium heat, sauté oil and garlic for a minute. Add spinach, kale, and basil and lower heat.
Season with Italian seasoning, salt, and pepper. On a cutting board, slice sausage into thin slices; set aside.
Mix together spinach mixture, cheese, and sausage together in a large bowl.
Wash and slice the peppers in half, remove stems and seeds.
Stuff the spinach mix into the peppers and line in a greased casserole dish. Bake in the oven for about 10-12 minutes.
Top with Parmesan cheese and extra sausage!