Preheat your oven to 400°F (205°C) and line a baking sheet with parchment paper.
Cut the chicken breast, zucchini, and red bell pepper into uniform 1-inch pieces for even cooking.
In a medium mixing bowl, whisk together the olive oil, lemon juice, dried oregano, sea salt, and black pepper.
Add the chicken and vegetable pieces to the bowl and toss until everything is thoroughly coated in the marinade.
Spread the mixture in a single layer onto the prepared baking sheet, ensuring the pieces aren't too crowded.
Roast for 18-20 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
While the chicken roasts, spread the hummus in a thick, smooth layer across the center of a large plate or platter.
Carefully pile the warm roasted chicken and vegetables directly onto the bed of hummus.
Garnish the platter with the crumbled feta cheese and whole kalamata olives before serving immediately.