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Whisk the oil with the lemon juice, oregano, lemon zest, salt, pepper, paprika and garlic in a large bowl. Add the chicken and toss to coat. Thread the chicken onto 8-inch (20 cm) wooden skewers.
Turn the grill on. Select the program Poultry and press OK. Lightly grease the cooking plates with cooking spray. Once the purple indicator light has stopped flashing, place the skewers on the grill and close the lid.
Cook, in batches, until the indicator light has changed to red. Serve the chicken skewers with Tzatziki sauce on the side.