01 -
Bring a large pot of salted water to a rolling boil. Add the penne and cook until al dente according to package instructions. Reserve 1/2 cup pasta cooking water, then drain.
02 -
Melt the unsalted butter in a large skillet over medium heat. Add sliced shallots and sauté for 6–8 minutes, stirring frequently, until deeply caramelized.
03 -
Add minced garlic to the skillet and cook for 1 minute, stirring continuously, until fragrant.
04 -
Transfer caramelized shallots, garlic, and roasted red peppers to a blender. Blend until completely smooth.
05 -
Pour blended mixture back into the skillet over medium-low heat. Add heavy cream, grated Parmesan, kosher salt, black pepper, and crushed red pepper flakes. Simmer for 2–3 minutes, stirring until creamy and heated through.
06 -
Add drained penne to the skillet. Toss well to coat every noodle in the red pepper sauce, adding reserved pasta water as needed to loosen the sauce.
07 -
Divide pasta among serving bowls. Garnish with additional Parmesan and fresh basil leaves.