Bring a large pot of salted water to a rolling boil, then add pasta and cook according to package directions until al dente—typically 8-10 minutes. Drain and set aside, reserving one cup of starchy pasta water for later use.
While water heats, prepare all vegetables: mince garlic, dice zucchini and bell pepper into bite-sized pieces, halve cherry tomatoes, and dice onion. Having everything prepped before cooking ensures smooth preparation and prevents burning ingredients.
Heat olive oil in a large skillet over medium heat, then add diced onion and sauté for 2-3 minutes until softened and fragrant. Add minced garlic and cook for exactly one minute, stirring constantly to prevent browning.
Add diced zucchini and bell pepper to the skillet, cooking for 5 minutes while stirring occasionally. These vegetables should begin softening but still retain slight firmness for this summer budget pasta dinner family recipe.
Pour the canned tomatoes with their juices into the skillet, then stir in Italian seasoning, salt, and black pepper. Simmer for 3-4 minutes until flavors meld beautifully and the sauce thickens slightly.
Add halved cherry tomatoes and cooked pasta to the sauce, tossing everything together gently for about one minute. If the mixture seems too thick, add reserved pasta water one tablespoon at a time until reaching desired consistency.
Remove from heat and fold in chopped fresh basil, red pepper flakes, and grated Parmesan cheese. Taste and adjust seasonings as needed before serving immediately to your hungry family.