Spaghetti Squash Alfredo

Scoop out and discard seeds from spaghetti squash halves. Prick outsides all over with sharp knife; season insides with 1/4 teaspoon with each salt and pepper. Microwave, cut sides down, on large microwave-safe plate on high 10 minutes or until tender. Meanwhile, in small saucepan, heat half-and-half and butter to simmering on medium-low; simmer 5 minutes, or until reduced slightly, then whisk in finely grated Parmesan cheese. With fork, scrape flesh of each squash half to separate into strands, leaving 1/2-inch border on sides; divide sauce among halves and top each with 2 tablespoons shredded mozzarella cheese. Broil 1 to 2 minutes or until bubbly and browned in spots. Optional: Serve with green salad.