Prep all ingredients: Mince garlic, dice shallot, chop basil and sun-dried tomatoes, and grate Parmesan cheese before starting.
Sauté aromatics: Heat butter in a large skillet over medium-low heat. Add garlic and shallot, cooking for 3 minutes until fragrant and translucent.
Add seasonings: Stir in black pepper, thyme, red pepper flakes, and tomato paste. Cook for 2 minutes, stirring constantly.
Cook tortellini: Add tortellini to the pan and pour in vegetable broth. Bring to a boil, then reduce to a simmer and cook for 3 minutes, stirring occasionally.
Create cream sauce: Pour in heavy cream and simmer for 1 minute. Stir in grated Parmesan until melted and smooth.
Finish the dish: Add sun-dried tomatoes and half the basil, stirring to combine. Taste and adjust seasoning with salt if needed.
Serve: Top with remaining fresh basil and extra red pepper flakes if desired. Serve immediately while hot.