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Adjust rack to middle position (top and middle positions for 8 servings) and preheat oven to 425 degrees. Bring a large pot (two large pots for 8) of salted water to a boil.
Drop cream cheese (in packets) in a small bowl of warm water to soften until ready to use. Wash and dry produce.
Cut broccoli into bite-size pieces if necessary. Halve, peel, and finely dice onion. Mince or grate garlic.
Generously coat a 9-by-13-inch baking dish (two 9-by-13-inch baking dishes for 8 servings) with nonstick cooking spray and set aside.