Melt the butter, add the whole garlic and let it turn golden brown. Add the spinach, season with salt and cook until soft on a low heat.
Warm the cream and mascarpone together with the chicken stock. Let simmer for a few minutes. Season with pepper.
Cook pasta al dente. Remove the garlic clove from the spinach. Mix the pasta well in a large bowl, first with the cream sauce, then with the spinach. Serve immediately. Serve with grated cheese.
The indicated amount is intended as a main course for 4 people and as a starter for 6 people.