Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the yellow potato into 1/2-inch cubes and toss them in a bowl with 0.25 tbsp of olive oil, half the sea salt, and half the black pepper.
Spread the potatoes in a single layer on the baking sheet and roast for 25-30 minutes, flipping halfway through, until they are golden and crispy.
While the potatoes roast, slice the chicken breast into bite-sized strips and chop the bell pepper and red onion.
Heat the remaining 0.25 tbsp of olive oil in a large skillet over medium-high heat.
Add the chicken strips and ground beef to the skillet, breaking up the beef with a spatula.
Season the meat with the remaining salt, pepper, garlic powder, and dried oregano.
Cook for 5-7 minutes until the chicken is cooked through and the beef is nicely browned.
Add the bell peppers and onions to the skillet and sauté for an additional 4-5 minutes until the vegetables are tender-crisp.
Serve the savory meat and vegetable mixture immediately alongside the hot roasted potatoes.