Preheat your oven to 400°F and lightly grease a grill pan or outdoor grill over medium-high heat.
Slice the zucchini into rounds and the red bell pepper into thick strips.
Toss the vegetables with 0.5 tablespoons of olive oil, 0.25 teaspoons of sea salt, and the black pepper.
Spread the vegetables on a parchment-lined baking sheet and roast for 18-20 minutes until tender and slightly browned.
In a small bowl, whisk together the remaining olive oil, lemon juice, garlic powder, smoked paprika, oregano, and the remaining sea salt.
Coat the chicken breast thoroughly with the marinade and place on the hot grill pan.
Grill the chicken for 6-7 minutes per side until the internal temperature reaches 165°F and beautiful char marks appear.
Let the chicken rest for 5 minutes before slicing it against the grain.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.