Preheat your oven to 400°F.
Season the chicken breast with your favorite herbs (such as rosemary, thyme, or oregano), a pinch of salt, and pepper.
Place the chicken breast on a baking sheet lined with parchment paper.
Chop the red bell pepper, zucchini, and carrot into bite-sized pieces. Toss them with a light drizzle of olive oil, salt, and pepper.
Spread the vegetables around the chicken on the baking sheet.
Roast the chicken and vegetables in the preheated oven for about 20-25 minutes, or until the chicken is fully cooked and the vegetables are tender with slight caramelization.
While everything is roasting, prepare the lemon tahini drizzle by whisking together the tahini and lemon juice in a small bowl. Add a splash of water if needed to achieve a smooth, drizzling consistency.
Once the chicken and vegetables are ready, slice the chicken into strips.
Assemble your bowl by layering the baby spinach, roasted vegetables, and sliced chicken.
Drizzle the lemon tahini sauce over the top and finish with sliced avocado.
Serve warm and enjoy your nutrient-packed, flavorful bowl.