Boil the Pasta: Bring a large pot of salted water to boil. Add the penne pasta and cook according to package instructions until al dente. Once cooked, drain and set aside, making sure to reserve a little of the pasta water.
Prepare the Vegetables: While the pasta cooks, wash and chop your vegetables into bite-sized pieces.
Add the Harder Vegetables: Toss in the carrots and broccoli florets. Cook for about 4-5 minutes until they start to soften.
Introduce the Bell Pepper and Squash: Add the red bell pepper, yellow squash, and zucchini to the skillet. Keep stirring and cooking for another 4-5 minutes until all the vegetables are tender-crisp.
Mix in the Tomatoes and Seasonings: Add the halved grape tomatoes, dried Italian seasoning, lemon juice, salt, and red pepper flakes to the skillet. Stir well and allow to simmer for another 2-3 minutes.
Combine the Pasta with Vegetables: Add the cooked penne to the skillet, tossing everything together. Adjust with reserved pasta water if needed.
Serve with Cheese and Parsley: Remove from heat and stir in the Parmesan cheese and fresh parsley. Serve warm.
Notes
Leftover Pasta Primavera can be stored in an airtight container in the fridge for up to 3 days.