Warm the olive oil in a large pan with high sides over medium heat.
Add the onion, celery, carrots, bell pepper, and zucchini and cook, stirring occasionally, until the veggies are translucent, about 10 minutes.
Season to taste with salt. Reduce the heat to medium-low.
Stir in the garlic and add the tomato sauce. Reduce the heat to low, partially cover the pan with a lid, leaving a small opening on the side, and let simmer, about 15 minutes.
Remove from the heat and carefully add the mixture to a blender. Blend on high speed until smooth, 1 to 2 minutes.
In the meantime, cook your pasta of choice in boiling salted water until al dente.
Combine the sauce and pasta, garnish with parm, and enjoy.
