Gnocchi Mac and Cheese

Bahan-bahan (6 porsi)

• 2 (1-pound) packages *DeLallo mini potato gnocchi or 3 (12-ounce) packages DeLallo gluten-free potato and rice gnocchi)
• 3 tablespoons cornstarch
• 1 cup vegetable or chicken stock
• 2 tablespoons butter or DeLallo extra virgin olive oil
• 3 cloves garlic, minced
• 1 cup milk, warmed
• 1 1/4 cups freshly-grated fontina cheese
• 1 cup freshly-grated sharp cheddar cheese
• 1/2 cup freshly-grated Parmesan cheese
• 1/2 teaspoon salt, or more to taste
• 1/4 teaspoon finely-ground black pepper, or more to taste
• (optional toppings: finely-chopped fresh parsley or basil, extra Parmesan cheese)