Heat oven to 400°F
Place Boursin in the center of a 9x13 dish, spoon half the pesto around it
Pour orzo around the Boursin, scatter tomatoes on top
Pour broth over everything, season with pepper
Add spinach over the orzo, top with frozen meatballs
Cover with foil, bake 20 minutes
Remove foil, stir into a creamy sauce, add remaining pesto and parmesan
Bake uncovered 10 to 15 more minutes until orzo is tender
Rest 3 to 5 minutes, finish with a squeeze of lemon (if you want)
