Cut the red bell peppers in half and remove the seeds and stems. Place them cut-side down on a baking sheet lined with parchment paper. Drizzle with olive oil.
Roast in the oven for 20-25 minutes, or until the skins are blistered and blackened. Remove from the oven and allow to cool slightly.
Once the peppers are cool enough to handle, peel off the skins and place the roasted flesh in a blender. Add the minced garlic and blend until smooth. Set aside.
In a large saucepan over medium heat, pour in the heavy cream and bring to a simmer. Gradually whisk in the blended roasted red pepper mixture until fully combined.
Stir in the Parmesan cheese and Italian seasoning. Continue to stir until the cheese is melted and the sauce is creamy. Season with salt and pepper to taste.
Meanwhile, cook the fettuccine pasta according to the package instructions until al dente. Drain and set aside.
Add the cooked fettuccine to the sauce, tossing to incorporate and coat the pasta evenly.
Serve immediately, garnished with fresh basil leaves for a pop of color and flavor.