Put split cloves of garlic in a small saucepan or heatproof measuring cup with oil and cook slowly over low heat until garlic is just brown. Discard garlic.
Drain pasta. Return to pot and toss with cheeses, herbs, and hot garlic oil.
Warm gently until cheese softens but still holds its shape. Season liberally with pepper.
Serves 4. (At our house, served 2 as a main course with a small salad.)