In a large skillet, brown the mini sausage balls until cooked through. This will take about 5-7 minutes. Drain off the grease and place the sausage balls on a plate lined with paper towels.
In a large pot, heat the olive oil over medium high heat. Add the onion and cook until tender, 3-4 minutes. Stir in the garlic and cook for 2 minutes. Stir in the red peppers, bay leaf, and red pepper flakes. Cook until peppers are soft, about 3 minutes.
Stir in the broth, tomatoes, and kale. Add the cheese tortellini and cook until tortellini is tender, 7-8 minutes. Stir in the fresh basil and season with salt and pepper, to taste. Stir in the mini sausage balls and heat until warm. Remove the bay leaf and serve.