Preheat your oven to 400°F (200°C).
Toss the chopped zucchini, red bell pepper, and red onion with one tablespoon of olive oil, dried oregano, salt, and pepper on a baking sheet.
Roast the vegetables for 20 minutes until they are tender and slightly browned.
While vegetables roast, cook the whole wheat penne in boiling water according to package instructions until al dente, then drain and set aside to cool.
Season the chicken breast with salt and pepper, then grill over medium-high heat for about 6-7 minutes per side until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing it into thin strips.
In a small dry skillet, toast the pine nuts over medium heat for 2-3 minutes, shaking frequently until they are golden and fragrant.
In a large mixing bowl, whisk together the remaining tablespoon of olive oil and the lemon juice.
Add the cooked pasta, roasted vegetables, sliced chicken, and toasted pine nuts to the bowl.
Toss everything together until well combined and serve warm or at room temperature.