Add the remaining ingredients to the pot (no need to rinse it), and stir until smooth and thickened.
1/2 cup (120 ml) whole milk, 1 cup (245 grams) plain low-fat Greek yoghurt, 1 tablespoon cornstarch, 1/4 teaspoon salt, 1/4 teaspoon garlic powder, 1/8 teaspoon black pepper, 1/8 teaspoon (m) paprika, 1 1/2 cups (170 grams or 6 ounces) sharp cheddar cheese, 1/2 cup (50 grams) Parmesan cheese