Step 1

Position a rack in the upper third of the oven. Place a large cast-iron baking dish or a rimmed baking sheet on the rack and preheat to 500 degrees F. Put the potatoes, garlic, olive oil, 1 tablespoon water and 1/2 teaspoon salt in a large microwave-safe baking dish and toss to coat. Cover with plastic wrap, pierce the plastic in a few places with a knife and microwave 8 minutes to partially cook.

Step 2

Meanwhile, pat the chicken dry and transfer to a bowl. Sprinkle with the paprika, 1 teaspoon salt and 1/2 teaspoon pepper. Add 2 tablespoons parsley and the lemon juice; toss to coat. Set aside.

Step 3

Remove the hot baking dish from the oven; carefully add the potatoes and spread in an even layer. Scatter the onions on top. Roast until the potatoes start to brown, about 12 minutes.

Step 4

Flip the potatoes and lay the chicken pieces on top, adding any accumulated juices from the bowl; return to the oven and roast until the potatoes are tender and the chicken is cooked through, about 12 more minutes. Remove from the oven and top with the remaining 2 tablespoons parsley. Serve with the lemon wedges.