Preheat the oven to 375 degrees and line a baking tray (you may need two) with parchment paper.
Chop eggplant, zucchini, and bell pepper and place on baking trays. Drizzle olive oil and salt over veggies and cook for approximately 30-35 minutes (shaking half way to loosen up the veggies). Remove from the oven when veggies start to brown. You can also broil the vegetables for 5 minutes on low right before you take them out to get a bit crispy and charred.
While vegetables cook, blend together the walnut pesto in a blender and set to the side (you can also store in the refrigerator), then follow directions on the pasta box to make your pasta.
Once pasta is done, drain water and add pasta to a medium mixing bowl.
Remove the vegetables from the oven and let cool for 5 minutes, then add to the medium mixing bowl with the pasta.
Add in arugula and top with walnut pesto. Mix well and you can always add in another ¼ cup of walnut pesto if you want it to be saucier. ENJOY!