Preheat your oven to 400°F (205°C).
In a small bowl, mix the olive oil with chopped fresh herbs, salt, and pepper to create a marinade.
Coat the chicken breast evenly with the herb mixture. Place it on a baking tray.
Chop the zucchini and red bell pepper into bite-sized pieces, and halve the cherry tomatoes. Toss the vegetables in a light drizzle of olive oil, salt, and pepper.
Arrange the vegetables around the chicken on the baking tray.
Roast the chicken and vegetables in the oven for 20-25 minutes, or until the chicken is fully cooked and the vegetables are tender.
While the chicken and veggies are roasting, prepare the lemon tahini drizzle by whisking together tahini, lemon juice, a small splash of water (if needed for consistency), and a pinch of salt.
Once cooked, slice the chicken and assemble your bowl by layering the roasted vegetables and chicken.
Drizzle the lemon tahini sauce over the bowl, and serve warm.