Preheat your oven to 400°F and line a baking sheet with parchment paper.
Cut the potato into small cubes and toss them with half of the olive oil, sea salt, and black pepper.
Spread the potatoes on the baking sheet and roast for 20 minutes until they begin to soften.
Season the chicken breast with the remaining sea salt, black pepper, and dried oregano.
Heat the remaining olive oil in a skillet over medium heat and cook the chicken for 5-6 minutes per side until fully cooked, then dice it into small pieces.
Gently flatten the biscuit dough and place the diced chicken, crumbled feta cheese, and Dijon mustard in the center.
Fold the dough over the filling, pinching the edges tightly to seal, and place the stuffed biscuit on the baking sheet alongside the potatoes.
Bake for an additional 12-15 minutes until the biscuit is golden brown and the potatoes are perfectly crisp.