Bring a pot of salted water to a boil and cook the pasta until al dente. Reserve 1/2 cup pasta water before draining.

In a blender, combine avocado, lemon juice, basil, 1 garlic clove, olive oil, some pasta water, salt, and pepper. Blend until smooth.

Thinly slice the remaining garlic. Heat a little olive oil in a pan and sauté until golden. Set aside.

Return the cooked pasta to the pot or a large bowl. Toss with the avocado sauce and Parmesan cheese (if using).

Top with crispy garlic slices and garnish with extra basil or Parmesan. Serve immediately.