Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Toss the chopped zucchini and red bell pepper with half of the olive oil, sea salt, and black pepper.
Spread the vegetables in a single layer on the baking sheet and roast for 20 minutes until tender and slightly caramelized.
Season the chicken breast with dried oregano, garlic powder, and a fresh squeeze of lemon juice.
Grill the chicken over medium-high heat for approximately 6 minutes per side until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing it into thin, even strips.
In a small bowl, whisk together the tahini, the remaining olive oil, and a splash of lemon juice until smooth.
Assemble your bowl by placing the warm quinoa at the base and topping it with the roasted vegetables, sliced chicken, and fresh avocado.
Drizzle the creamy tahini dressing over the entire bowl before serving.