Heat a large skillet over medium heat and melt the butter
Add prepared shrimp to the skillet and cook for 2-3 minutes until they turn pink and opaque
Incorporate the diced tomato, chopped basil, and minced garlic, stirring to combine
Cook the mixture for 1-2 minutes until fragrant
Sprinkle flour over the mixture and stir continuously until completely incorporated
Pour in the heavy cream while stirring, then add the Parmesan cheese
Once the sauce begins to thicken, add the cooked and drained tortellini
Gently toss everything together until the pasta is evenly coated with sauce
Season with salt and pepper to taste
Serve immediately, garnished with additional Parmesan and fresh basil