For a vegetarian version, simply omit the chicken and add a can of drained and rinsed chickpeas or white beans to the pasta along with the butternut squash. Roasting the butternut squash brings out its natural sweetness and creates a caramelized crust. Don't overcrowd the sheet pan, or the squash will steam instead of roast. If necessary, use two sheet pans. Fresh herbs add a vibrant flavor to the dish, but you can substitute dried herbs if fresh are not available. Use about 1 teaspoon of each dried herb. Pounding the chicken breasts to an even thickness ensures that they cook evenly on the grill. Feel free to add other vegetables to this dish, such as bell peppers, zucchini, or onions. Roast them along with the butternut squash.