Cook pasta according to package directions, then set aside.
In a large saute' pan over medium-low heat, sauté' garlic in olive oil and butter briefly.
Stir in crushed red pepper flakes, then stir in flour and saute for one minute, while stirring constantly.
Continue to stir while adding in broth and half and half:bring to a simmer then lower heat and stir until thickened.
Stir in Parmesan cheese until melted.
Add Kielbasa and heat through.
Season with salt and pepper
Pour sauce over cooked pasta and garnish with chives, tomatoes and extra Parmesan.
Serve Hot and enjoy!