Bring a large pot of salted water to a boil and cook the pasta until al dente. Reserve 1 by 2 cup pasta water, then drain and set aside.
Blend soaked cashews, plant-based milk, nutritional yeast, lemon juice, salt, and black pepper until smooth and creamy.
Heat olive oil in a skillet over medium heat and sauté garlic until fragrant.
Add sun-dried tomatoes and red chili flakes, cooking briefly to release flavor.
Reduce heat and stir in the blended cashew sauce and Italian seasoning. Simmer gently for a few minutes.
Add cooked pasta to the skillet and toss until fully coated, using reserved pasta water as needed to loosen the sauce.
Finish with fresh basil, adjust seasoning, and remove from heat.