Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Slice the bell pepper, zucchini, and red onion into uniform 1-inch chunks.
Place the vegetables on the baking sheet, drizzle with half of the olive oil, and sprinkle with half of the sea salt, black pepper, smoked paprika, and garlic powder.
Toss the vegetables to coat evenly and roast in the oven for 20-25 minutes until tender and slightly browned.
While the vegetables roast, pat the flank steak and chicken breast dry with paper towels.
Season both sides of the steak and chicken with the remaining sea salt, black pepper, smoked paprika, and garlic powder.
Heat the remaining olive oil in a heavy cast-iron skillet over medium-high heat until shimmering.
Add the steak and chicken to the skillet, searing the steak for 3-4 minutes per side for medium-rare and the chicken for 5-6 minutes per side until the internal temperature reaches 165°F.
Remove the meats from the skillet and let them rest for 5 minutes before slicing the steak against the grain and the chicken into strips.
Serve the charred meats alongside the roasted vegetables for a clean, nutrient-dense meal.