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Place cream cheese packets in a small bowl of warm water to soften.
Preheat a well-oiled grill (or grill pan) to medium-high heat.
Wash and dry produce.
Cut potatoes into 1-inch-thick wedges; place in a large microwave-safe bowl. Toss with a large drizzle of oil, rosemary, salt, and pepper. Cover with plastic wrap; microwave until tender, 5-7 minutes.
Arrange potatoes in a single layer in the center of a large piece of foil. Cinch into a packet and add to grill; grill until potatoes are cooked through, 60-90 seconds per side (grills can vary). TIP: If using a grill pan, add microwaved potatoes to hot pan; cook, undisturbed, until grill marks form, 2-3 minutes per side.