Cook pasta according to package directions.
When the pasta is about 10 minutes away from being cooked, add the butter to a large skillet over medium heat. Once it melts, add in the flour and cook for 1-2 minutes, stirring often.
Add in the minced garlic, chicken broth, and tomato paste. Mix well and let it simmer for 1-2 minutes.
Whisk in the heavy cream.
Stir in the sun-dried tomatoes, red pepper flakes, dried oregano, salt, and pepper.
Add in the cooked chicken and let everything summer for approximately 5 minutes.
Stir in the grated parmesan and take the skillet off the heat.
Drain the pasta and add it to the skillet. Toss until coated and serve immediately topped with additional parmesan.