Reduce pan heat to medium-low and add butter. Sauté garlic in butter for one minute, then sprinkle in flour. Let flour cook, stirring for about two minutes. Then add broth, heavy cream, sundried tomatoes, Italian seasoning, crushed red pepper, 1/2 teaspoon kosher salt, 1/4 teaspoon freshly ground black pepper. Increase heat to medium-high and bring to a simmer until thickened, stirring as it thickens. Remove from heat and stir in parmesan. Taste and adjust seasoning as needed. Finish with fresh parsley.