Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the Yukon gold potato into small half-inch cubes and chop the bell pepper, zucchini, and chicken breast into bite-sized pieces.
In a large bowl, toss the chicken, potatoes, peppers, and zucchini with the olive oil, dried oregano, garlic powder, sea salt, and black pepper until evenly coated.
Spread the mixture onto the prepared baking sheet in a single layer, leaving a small space in the center.
Place the feta cheese block or chunks in the center of the sheet pan.
Roast in the oven for 15 minutes, then add the halved cherry tomatoes to the tray.
Continue roasting for another 10 minutes or until the chicken is cooked through and the potatoes are golden and tender.
Remove from the oven, garnish with freshly chopped parsley, and serve immediately.